Nova (1974–…): Season 42, Episode 1 - Big Bang Machine - full transcript
On July 4, 2012, scientists at the giant atom smashing facility at CERN announced the discovery of a subatomic particle that seems like a tantalizingly close match to the elusive Higgs Boson, thought to be responsible for giving all the stuff in the universe its mass. Since it was first proposed nearly 50 years ago, the Higgs has been the holy grail of particle physicists: finding it completes the "standard model" that underlies all of modern particle physics. Now CERN's scientists are preparing for the Large Hadron Collider's second act, when they restart the history-making collider, running at higher energy -- hoping for the next great discovery that will change what we know about the particles and forces that make up our universe.
They built the largest,
most complex machine in history,
to probe the deepest mysteries
of the early universe,
as it was
at the beginning of time
The Large Hadron Collider is
allowing us to see right back
to ten to the minus 12 seconds
after the Big Bang
Within two massive detectors,
in conditions harsher
even than outer space,
tiny particles smash together
at nearly the speed of light
unleashing incredible energy
Trying to figure out
what happens in the collision of
two protons at very high energy
is like analyzing what happens
in the high-speed collision
of two garbage trucks
Within that spray of debris,
physicists search
for a tiny bundle of energy,
a subatomic particle
proof of an invisible energy
field that fills all of space
It just may be
the most important feature
of our universe
Without it
There are no atoms,
there's no chemistry,
there's no life
50 years of effort, $10 billion,
and thousands of researchers
around the world
For them, the stakes have
never been higher
It's practically
my whole professional life
that's led to this point
It's the moment of truth
when science flips the switch
on the Big Bang Machine
One, zero
Right now, on NOVA.
In Europe, a stunning
announcement
One of the world's
most-wanted fugitives
has finally been captured
Done!
The announcement came
at the end of a high-speed,
high-stakes chase
A mystery
300 people were hot on the trail
Decades worth of work
It was a truly
international effort
that drew to its dramatic
conclusion here
It's a historic milestone today
On the border of France
and Switzerland,
300 feet below ground
But this wasn't a search
for some outlaw
or criminal mastermind
It was a hunt for something
far more elusive
An unstable bundle of energy
far smaller than an atom
that winks out of existence
in a trillion trillionth
of a second
It's evidence of a force
that fills all of space,
completely invisible,
and yet without it,
life, earth, the universe
we know could not exist
Finding this elusive particle
marks the end of a quest
that required constructing the
largest, most complex machine
the world has ever seen
A quest that consumed nearly
half a century,
billions of dollars,
and asked thousands of
scientists across the globe
to invest years,
even decades of their careers
with no guarantee of success
I got a job to do this in 1993
It's eleventh year now
About ten years, me
Yeah, and about
five years for me
20 years, something like that
Since 1994, I guess
It's practically my whole
professional life
that's led to this point
The discovery has been hailed
as one of the greatest
scientific victories of all time
and has already won
the Nobel Prize
It's an enormous triumph
This was my generation's
Manhattan Project,
and I wanted to be on the inside
looking out
It's been extremely exciting
But what is
this mysterious quarry?
What does it actually do?
And why was finding it
so important?
That story begins at the
very beginning of time,
when the universe came into
being in a massive explosion
called the Big Bang
So here we have the Big Bang
Billions of years ago
Deserves a little bit
of color, I think
And then the timeline
of the universe
This is where we are
This now the age
of the universe,
like 13 7 billion years
after the Big Bang
And so working backwards,
we had the dinosaurs
So here's a dinosaur
Then life itself, first DNA was
about four billion years ago
Before DNA, there was the earth
Before that, the first stars
Before them, just atoms
While atoms were once thought
to consist
of just three basic particles...
Neutrons, protons
and electrons...
Physicists now know
some of these are made
of even more fundamental stuff...
The basic building blocks
of our universe
The big question then is
where did those building blocks
come from?
The answer to all that lies
in the first second
In the first instant
of existence,
when the universe was
unimaginably hot,
the cosmos was filled with
identical bundles of energy
moving at the speed of light,
all indistinguishable
from one another
But then something changed
Distinct types
of particles emerged
with different properties,
like electric charge
and mass, what we
experience as weight
Now we live in a universe
full of tangible stuff
And while that monumental shift
from nothing to something
must have happened
almost immediately,
how it happened
was one of the biggest
unanswered questions in physics
The mysteries of existence lie
within this second
Certainly we understand
the science,
we understand the physics
Work backwards into this second,
but at some point we just
run out of knowledge
And the Large Hadron Collider
is allowing us to see
right back to ten to the minus
12 seconds after the Big Bang
Beyond that, here be dragons
or dinosaurs
The Large Hadron Collider is
a massive particle accelerator,
the largest machine
in the world,
designed to simulate
the universe as it was
a trillionth of a second
after the Big Bang
To solve the mystery of mass,
it smashes protons together
at energy so high
that it is capable of testing
an idea first suggested in 1964
by several scientists
around the world,
including a young theoretical
physicist named Peter Higgs
His mathematics suggested that
right after the Big Bang,
an invisible energy field was
somehow switched on
and now fills
the entire universe
Just the way that a magnetic
field affects some materials
but not others, he suggested
that this new field
selectively affects
some fundamental particles,
causing some of them
to take on mass
Very massive particles
like the quarks that make up
protons and neutrons
interact strongly
with this field
Electrons, which form the
outer shells of atoms,
interact less strongly
and are very lightweight
And still others, like photons,
particles of light,
have no mass, because they don't
interact with the field at all
The theory implied that a
universe without a Higgs field
might not be
a very friendly place
And that got people's attention
If there were no Higgs
mechanism,
elementary particles
wouldn't have mass
If electrons didn't have mass,
that means they would move
at the speed of light
And if electrons moved
at the speed of light,
electrons do not settle down
into atoms
And if electrons do not settle
down into atoms,
there are no atoms,
there are no molecules,
there's no chemistry,
there's no life
Nothing
It would look nothing
like what we see today
We wouldn't be here,
and there would be no physicists
to ask these questions
When Higgs submitted his theory
to a journal,
the editors based at CERN
rejected it
My reaction was
that they clearly hadn't
understood what I was saying
Undeterred, he revised
the paper,
adding a paragraph saying,
in effect,
that if the field exists,
we should find evidence of it
in the form of a particle that
would turn up in an accelerator
In other words, if you smash
particles together
energetically, you'll make
a ripple in the field
And if you apply enough energy,
you just might be able to detect
it in the form of a particle
The second time around,
an American journal published
the paper
and Peter Higgs got
a lot of credit
But in reality, the idea was
cooked up independently
by a bunch of scientists:
Philip Anderson, Robert Brout,
François Englert,
Gerry Guralnik, Carl R Hagen,
Peter Higgs, Tom Kibble,
Gerard 't Hooft
Some have suggested that it
really should be called this
But since that's impossible
to pronounce,
it's simply called
the Higgs field
Gradually, the theory
gained support,
but without the evidence
of a particle,
now called the Higgs boson,
it remained unproven
To be honest, we weren't sure
that the Higgs existed
Mr Higgs and his collaborators
were saying that there was
an invisible energy field
everywhere in the universe
So the "invisible"
sounds a little odd,
and the "everywhere in
the universe" also sounds
kind of far-fetched
So that was a lot
for people to swallow
There were many people
who thought
this can't be the answer
I've heard people describe it
as a trick,
a mathematical trick to make
the equations work out
Finding something
that's all around us
is surprisingly tricky
Because the Higgs boson
doesn't actually exist
At least not in any form
that we can easily detect
So in 1998, scientists from
around the world came together
at CERN, the Center for European
Nuclear Research,
located on the border of France
and Switzerland,
to build a particle accelerator
that would have enough power
to create such a profound
disturbance in the Higgs field
that the predicted Higgs bosons
would pop into existence
and present themselves
But easier said than done
In order to find this particle,
we had to build this complex,
cutting-edge accelerator
The work is the work of
thousands of people
20 years of effort went
into building these detectors
20 years of efforts of
the international community
From dozens of nations,
with the U S contributing
$500 million
It took $10 billion
and ten years
to complete
the Large Hadron Collider,
a massive masterpiece
of engineering,
to find one of the tiniest
pieces of the cosmos
It's a very cool
and expensive eye
that can look at very,
very small distances
like about a billionth
of a billionth of a meter
We designed this machine
so that wherever the Higgs boson
would be,
we would be able to find it
Flushing the Higgs out of hiding
begins in a modest little red
bottle full of hydrogen atoms,
the smallest and most abundant
element in the universe
All the protons that we use
at CERN are taken
from a bottle that size
They start their journey here
and they continue
down this orange line, and that
is the linear accelerator
Trillions of hydrogen atoms
stripped of their electrons
are injected into the collider
Every 12 seconds
ten to the power 14 protons
are being accelerated
down that line
The protons accelerate around
larger and larger loops
until they are finally directed
into the main ring
To keep the increasingly
energetic particles confined,
the LHC relies on immensely
powerful magnetic fields
generated by 1,232 primary
superconducting magnets,
cooled to just a few degrees
above absolute zero
by 120 tons of liquid helium
After about 20 minutes
of acceleration,
each bunch of protons is moving
at nearly the speed of light,
with as much energy
as an onrushing locomotive
Finally the protons are
carefully steered
into violent head-on collisions
converting the huge energy
into showers of exotic,
energetic particles, scattering
in all directions,
many decaying into showers
of even more particles,
setting the stage for the hard
work of detecting the Higgs
Trying to figure out
what happens
in the collision of two protons
at very high energy
is like analyzing what happens
in the high-speed collision
of two garbage trucks
Garbage is spread
all over everything,
and most of it is garbage in the
sense that it's not interesting
It's old stuff
that we already knew about
And in all this garbage
that's spraying out
in all directions
on the highway,
you have to find
the golden needle,
the rare artifact that you're
looking for, the Higgs boson,
something entirely new
To the scientists at CERN,
a collection of physicists
from all over the world,
the stuff produced in these
powerful collisions
is anything but garbage
Each particle has a
well-understood identity,
described with great precision
in one of the most accurate
theories ever devised
to explain the workings
of the universe
It's called the Standard Model,
and one of its key contributors
is Frank Wilczek
Hi, welcome
Come on in
A lot of what I do
is really just play
I mean, I play
with the equations and ideas
All that playing won Frank
a Nobel Prize
for his contribution
to the Standard Model
Well, what have we got here?
It looks like an instrument
of torture for the mind
The Standard Model is
essentially an understanding
of how all the known pieces
of the universe fit together,
except for the mechanism
of gravity,
creating a mind-boggling
tapestry
This is going to be a hell
of a puzzle
to figure out
All right, now,
a promising start
We think the Standard Model
contains all you need
in principle to describe
how molecules behave,
all of chemistry, how stars
work, all of astrophysics...
Not only how things behave,
but what can exist
These are the rules of the game
The ingredients of the Standard
Model are of three basic sorts
There's what you might
broadly call matter
That's sort of lumps of stuff
that have a certain degree
of permanence
And these are,
on the one hand, quarks
They include the building blocks
of protons and neutrons
and atomic nuclei
And leptons
Most prominent lepton
in everyday life
is certainly the electron
So those are matter particles
On the other side, we have what
you might call force particles
or force mediators
Called "bosons,"
some of these particles are
more like lumps of energy
They transmit the forces
that bring the matter
particles to life
They include the photon,
which carries
the electromagnetic force;
the gluons that carry
the strong force
which holds protons
and neutrons together;
and the W and Z bosons
that are responsible
for the weak force
governing radioactivity
With just this small list
of ingredients,
the Standard Model explains
the physical properties
of the elementary building
blocks of nature
The Standard Model is just a
handful of particles and forces,
and it explains every experiment
ever done
by every human being
in the history of science
So it's quite impressive
in what it's managed to do
It explains how stars burn
It explains
how radioactivity occurs
It explains how chemistry works
It explains how light works
It's an amazing theory
The first particles were
discovered in experiments
and became the foundation
for the Standard Model
But then the theorists took over
and all the particles discovered
in the last 40 years
were first predicted
by the mathematics
of the Standard Model
and then found experimentally
The Higgs boson, a force
particle, was the last
and most challenging piece
of the puzzle
That's why finding it was such
an obsession among theorists
and experimentalists alike
In September 2008,
with much fanfare
the giant accelerator
was switched on
The LHC was ready to go to work
It was an exciting time,
full of high expectations
Designing and building
this machine,
it's just incredible to see it
come to life
But then, just nine days
after start-up
disaster struck
It was 11:00 in the morning,
and I got a call to come over,
something looks serious
And when I got over there,
I had never seen such carnage
A short circuit burned a hole
in a giant container of liquid
helium used to cool the magnets
Six tons of helium was released
into the tunnel
and more than 50 of the giant
magnets were fried
The $10 billion LHC
was dead in the water
Undaunted, engineers worked
to repair the machine
and physicists continued to
refine the computer programs
that would analyze
the vast amount of data
that the LHC would produce
once it was running
at full power
Three, two, one
By late 2009, after 14 months of
repair work and reengineering,
the LHC was more robust
than ever
and finally ready to begin
the hunt in earnest
Now, protons are whizzing
both ways around the ring
at nearly the speed of light
At the center of the two Higgs
detectors, the beams cross
inside ATLAS, a massive machine
the size of a cathedral
and also within its smaller
cousin, CMS
Even though the beams are
microscopically small,
the vast majority of particles
contained in them
whiz past each other
without incident
When you collide 100 billion
protons and 100 billion protons,
most of the protons are
just seeing each other
and going, "Hello," and going on
But about 800 million times
every second,
pairs of protons meet head-on
What's called a "hard collision"
When the proton breaks up
so it's no longer a proton,
that's an interesting collision
And that happens
only about 20 times
out of all these billions
of protons crossing
In each of these powerful
collisions,
dozens of new particles
flash into existence
and spray outward, their unique
signatures tracked
by the huge detectors,
capturing the action
40 million times a second
Incredibly fast, but still not
able to spot the Higgs directly
The Higgs is actually kind of
a difficult particle to find
It's kind of subtle
in how you look for it
As soon as you create it,
it decays very, very quickly
The lifetime of a Higgs
is about one zeptosecond,
which is like
ten to the minus 21 seconds
So, in fact,
you'll never even see it
in a particle accelerator
It doesn't move that far,
enough for you to see any track
left behind
And so, the only way to detect
the Higgs would be by spotting
the more familiar particles
that the quickly vanishing Higgs
decays into
The math predicted
about a dozen different possible
decay modes, as they're called
But the relative likelihood
of any of them
depended on the mass
of the Higgs
which was a total mystery
It must have seemed like
a cosmic joke on the theorists
The irony, if you like, is that
although the Higgs field that's
related to the Higgs boson
gives other particles mass,
the one property of the Higgs
boson that was not predicted
by Professor Higgs
and his colleagues
was the mass
of the Higgs boson itself
So its mass could have
been anything
from very, very light by our
standards to very, very heavy
Since the Higgs could
theoretically decay
in so many different ways,
the Higgs hunters had
to be willing to sift
through all
of the collision debris,
looking for slight increases
in the number
of detectable particles,
with very specific
characteristics,
into which the Higgs could
possibly decay
So it's not like looking
for a needle in a haystack,
when at least you know
that you found a needle
It's like looking for hay
in a haystack
You're looking for a little bit
more hay with certain properties
than certain other properties
That daunting challenge meant
building enormously
complicated detectors
to track and count
every bit of debris
coming out of those collisions
And then we have to somehow,
with all of the particles
that come out of this event,
we have to reconstruct them and
find if there are new particles
that are happening
The mathematics predicts that
the Higgs should often decay
into particles that are also
maddeningly hard to detect...
Like quarks, the particles that
make up protons and neutrons
in the nuclei of atoms
They looked in every
possible way they can look
In the end,
they looked for the Higgs boson
decaying into photons
Out of every thousand
Higgs bosons created,
a few should decay in a way that
produces a pair of photons...
Light particles
which can be measured very
precisely in the detectors
By knowing the energy and angle
between pairs of photons,
scientists can tell if they
were likely produced by a Higgs
And by looking for unexpectedly
high concentrations
of certain photons
over billions of collisions,
scientists hoped to zero in on
the Higgs and, as a consequence,
pinpoint its exact mass...
The one missing value
in the theory
It proved to be a statistical
sifting process
of dizzying complexity
Luckily, they had a head start
Years of experiments in other
colliders had ruled out
many possible masses
for the Higgs,
measured in units called
gigaelectronvolts, or GEV
So on this line of what the mass
of the Higgs might be,
we can draw on what previous
experiments have
have tried and where
they've been able
to exclude it from being
A less powerful accelerator,
the LEP Collider at CERN,
a predecessor of the LHC,
had already ruled out the Higgs
being at the bottom end
of potential masses
In fact they were able to say
that the mass of the Higgs
is, with 95% confidence,
114 GEV or more
So after LEP, the next major
milestone in the
in the Higgs search was limits
set by another collider
in the US, the Tevatron
The Tevatron was able to exclude
a range here around 160 GEV here
In 2011, CERN moved that upper
boundary still lower
The LHC has been able to rule
out a big region
from 145, quite far up
But this last remaining
energy range
was also the trickiest to search
It's the area in which the
unique signature of the Higgs
would be mostly deeply buried
under the background noise
of other particles
created in the collider
If I was to bet,
I would probably
put it at 130 GEV
Probably somewhere around
120 GEV
Somewhere between 120
and 130 GEV
114 GEV because it's the most
difficult place to look
and we haven't found it yet
Ah, that's a good question,
because you know you are
assuming that the Higgs
actually exists, which I'm-I'm
starting to believe
it probably does not exist
As data piled up at the LHC,
scientists narrowed the range
even further
It seemed that they were either
about to close in
on the Higgs particle or prove
that it didn't exist at all
People were beginning to worry
a little bit
that we hadn't found
the Higgs yet
and maybe weren't going
to find it
And that would've been
a complete shock
because we know that something
is doing the job of the Higgs
You start to get a little
nervous
because either it's there
or there isn't a Higgs boson
at all
By the end of 2011, the window
narrowed even further
The LHC, with the new data
from the whole of 2011,
is able to expand the area that
it can exclude the Higgs from
The new lower limit had risen
to 115 GEV,
and the new upper limit dropped
to 127 GEV
And within that range,
interesting things were showing
up in the data
So the really exciting thing
was that the reason the LHC
experiments weren't able
to exclude anything inside
this remaining window
is that in fact they see
an excess of events,
the early signs of the
Higgs boson, if it's there
An excess of events means
that the LHC was producing
more particles of interest...
In particular, pairs of photons
So, what you're looking for is
called a bump
because at that
particular energy,
you should see a lot more decays
if there is a Higgs boson
So if you see a bump, that's a
clue that something's going on
Those excess photon pairs were
showing up in not just one
but in both detectors, and at
practically the same mass
CMS was seeing a spike
in the number of photons
which could be the signal of a
Higgs with a mass of 124 GEV
And ATLAS was seeing a
similar spike near 125
Now with the hunt finally
closing in,
the LHC continued smashing
protons,
sorting through the debris
and piling up the data
for another six months
We saw a signal growing, growing
every week, every day
Until at last, on July 4, 2012,
the heads of ATLAS and CMS,
Fabiola Gianotti and
Joe Incandela, called a meeting
Two presentations from the two
experiments, ATLAS and CMS
There to hear the news
firsthand: Peter Higgs himself
It was standing room only
Good afternoon,
everybody in Melbourne
But it was also beamed live
around the world
So, of course,
everyone's heard lots of rumors
at this point,
within the collaborations
But there are these two
collaborations,
the CMS collaboration and
the ATLAS collaboration
And we aren't supposed to know
what they have, and I didn't
You know, you'd heard stories,
but I hadn't seen their data
So that's kind of exciting
So, today is a special day on a
search for a certain particle
But no one was quite prepared
for the short, definitive
announcement that was to come
And I ask Joe Incandela from CMS
to take the floor
This was about to become one of
the defining moments
in the history of physics
and science
And the energy was so incredible
It was like a big party
People were really excited
And it was just then I think
I started to really appreciate
where we were and that this was
a major discovery
This slide shows you one event
taken just a few weeks ago
I put the slide up and before
I could say anything,
there was a gasp
across the whole audience
Now, a major result like this
from one experiment
could still be wrong
Now we go immediately to ATLAS
Fabiola Gianotti, please
Thank you
But Fabiola brought the same
confidence for her results
You can already see here
the compatibility between
what we observed: one big spike,
here in this region here
If you look at these plots
that were shown,
first thing you want to see is
did CMS and ATLAS find the bump
in the same place?
And in fact they had
An excess at a mass of 126 5 GEV
Both teams had found an excess
of photons
pointing to the same mass
And that was pretty convincing
So you're going,
"Wow," like, "we rock"
As a layman I would now say
I think we have it
You agree?
The LHC had found
the Higgs particle
We have observed a new particle
consistent with a Higgs boson
It's like running a marathon
Suddenly you realize you crossed
the finish line
Maybe one more round of applause
to all the guys
who took part in the project
for more than 25 years
It comes as a big surprise
to me, I must say
I went into that seminar
expecting good results
But I was gobsmacked,
as they say
The hunt that spanned
half a century was over
The Higgs boson hid for 50 years
But, you know, like they said
with the Canadian Mounties,
"They'll get their man"
It could run,
but it couldn't hide forever
It appeared Higgs and his
colleagues had been right
The mystery of how particles
gain mass had been solved
The last piece of the Standard
Model had been found
For me it's really
an incredible thing
that it's happened
in my lifetime
I had the pleasure
to meet Peter Higgs
at the end of the seminar
and exchange a hug
He told me,
"Congratulations to you
and your experiment
for this incredible achievement"
And of course, I replied,
"Congratulations to you!
You are the first person to be
congratulated"
I think it's not appropriate
for me to answer
any detailed questions
at this stage
This is an occasion celebrating
an experimental achievement
and I simply congratulate
the people involved
Ironically, the achievement took
place at the very same institute
where nearly 50 years earlier,
an editor had rejected Higgs'
initial paper
The Royal Swedish Academy
of Sciences
In a fitting end to the saga,
Peter Higgs and Belgian
physicist François Englert,
who had independently come up
with the idea
for the Higgs field,
won the 2013 Nobel Prize
Englert's colleague,
Robert Brout,
certainly would have been
honored as well
had he lived to see the day
So why is all this important?
Why does proving the existence
of the Higgs field matter?
Building an enormous Big Bang
machine to recreate conditions
in the universe near
the beginning of time
and completing
the Standard Model
is a tremendous scientific
achievement
Finding the Higgs sheds light
on all of particle physics
and cosmology
It's all connected
All our models of how the
universe began, how it expanded,
everything, is, you know,
affected by the Higgs field
and by how we understand
the universe
Perhaps discovering the Higgs
boson and the field it proves
will open new doors
The discovery of the Higgs
is just the first step
In science you make
a step forward...
You answer a question, but then
other questions open up
into even greater mysteries
that still remain
beyond the Standard Model
The Standard Model can't be
the final thing
There is something beyond the
Standard Model; we know that
Hopefully the Higgs can give us
some guidance in that direction
Yes, we do know
the Standard Model works
It works incredibly well
But we know it's not
the whole story
And any time in the history
of physics
where people thought they had
the whole story they were wrong
And so we're looking for what
is the next piece,
not just in terms
of one particle
but in terms of forces, in terms
of understanding nature
The number of mysteries in
the Standard Model is huge,
which is fine because,
as a scientist,
I'm drawn to mysteries
One mystery that the
Standard Model can't answer
is perhaps the most fundamental
of them all
Why isn't our universe empty?
Because according
to the mathematics
behind the Standard Model,
it should be
Science has given us a set of
laws that describe the world
so accurately that we can
predict the motion of a coin
tossed in the air because we
understand the law of gravity
We understand electromagnetism
so well
that we can use our GPS
satellites to locate your car
to within a few inches
And we understand
the nuclear force so well
that we can predict the future
evolution of the sun itself
Those mathematical equations
that work so well
to describe the laws
of the physical world
are bound together by something
that we see around us every day
Something that characterizes
our faces
and the natural world
even the tiniest structures
like viruses and our DNA...
Symmetry
In the Standard Model,
symmetry rules
The laws are dictated, really,
in their form
by requiring tremendous amounts
of symmetry
That's how we found them
The equations of the Standard
Model seem to predict a universe
in perfect balance, formless
and without structure
as it was at the very beginning
And if it had remained that way,
nothing would exist
If the laws of science are
framed in their most perfect,
most symmetrical form,
then life cannot exist at all
There'd be no mountains, rivers,
valleys,
no DNA, no people, nothing
A universe created along
absolutely symmetric principles
would be in perfect balance
The Higgs field is the first
clue to what broke the symmetry
of that completely uniform
early universe
The state of perfect symmetry
is very similar
to the state of perfect balance
Think of a spinning top
It exists in a state of
perfect rotational symmetry
No matter how you rotate,
everything looks the same
Even more so than the symmetry
of a spinning top,
at this instant of creation,
every place in the universe
would have been symmetrical,
identical to every other place
But perfection isn't stable
The slightest imperfection,
the slightest little defect
will cause it to vibrate,
perturb,
and fall to a lower energy state
Symmetry has been broken
Within a fraction of a second
of the Big Bang,
physicists believe the absolute
symmetry of the universe
was shattered
by a tiny fluctuation
The Higgs field appeared
in all of space
The forces split apart
The particles of the Standard
Model became distinct
Structure emerged
This fall from perfection
was what allowed us
to come into being
Everything we see around us
is nothing but fragments
of this original perfection
Whenever you see a beautiful
snowflake, a beautiful crystal,
or even the symmetry of stars in
the universe, that's a fragment
That's a piece of
the original symmetry
at the beginning of time
Finding and studying the Higgs
is a vital first step
in the quest to understand
that early state
when the particles that make up
what we can perceive
came into being, as well
as a much greater quantity
of mysterious stuff
that we know is out there
but that we can't directly
detect, called dark matter
What are these missing pieces?
When James Gates came
to study at MIT,
he was determined to unlock the
secrets of the early universe
and understand what happened to
the unity that was once there
The universe and we are
intricately tied together
This idea of unity
turns out to be
one of the most powerful
driving themes in physics
and it keeps getting us to look
for deeper and deeper
connections
So ultimately, perhaps, we exist
because the universe
had no other choice
He looked at the Standard Model,
the matter particles and the
bosons, the force particles,
that hold everything together
He wondered if these two groups
of particles
that seem so different
could be related
in some profound and hidden way
This question...
Why is there a fundamental
asymmetry of forces and matter...
Led him to a powerful
mathematical theory
called supersymmetry
It was the asking
of this "what if?" question
that drove the construction
of supersymmetry,
which had an incredible
resonance for me
when I was a graduate student
I saw one more beautiful balance
that we could put in nature
One of the pioneers
of supersymmetry,
Jim Gates saw in the mathematics
a possible hidden world
of new particles
no one had suspected
Mathematics leads us to find
things we didn't know
were there before
Supersymmetry is an example
of that
We know about ordinary matter
The mass leads you on
to discover supermatter
and superenergy
The theory gives every matter
particle a force partner
and every force particle
a matter partner
These heavier supersymmetric
twins are labeled sparticles
So once you believe this math
that says there's
more to existence,
then you have to wonder what
these other things are
You have to name them, at a very
you know, at the very first step
So in nature there is a thing
called the electron
The math says it has
a superpartner
called the selectron
Muon, it'd have to be a smuon;
photon, there'd have to be a
photino;
quark, there'd have to be
squarks;
Z particle, there'd have
to be zino;
the W particle,
there'd have to be a wino
And that's how supersymmetry
works
According to supersymmetry,
matter and forces aren't
so distinct after all
There's a grand symmetry
between them
but we can currently see only
one partner from each pair
However strange it seems,
this theory has gained
widespread support
from theoretical physicists
Not just for the beauty
of its equations
but for what it might
help explain
When supersymmetry began
as a topic of discussion,
no one realized what it can do
It turns out that studying
the mathematics,
we get a firm foundation
for the existence of everything
Supersymmetry could shed light
on dark matter...
The missing particles
that aren't included
in the Standard Model...
And even help to explain
how symmetry was broken
in the first place
I very much want supersymmetry
because it's a beautiful thing
by any standard
and would take our understanding
of nature to a new level
So I want that
Finding the Higgs pushed
the LHC to the limit
of what it could do
So, a few months after
the Higgs announcement
the scientists at CERN shut down
the giant collider
and began a planned
two-year upgrade
As it begins its second act,
it will smash protons
even more energetically
So when the LHC turns back on
in 2015,
we will be at twice the energy
we were before
The increased power will help
physicists to study the Higgs
with more precision, but the
real hope is that they will find
something entirely new
Every single experimentalist
is only thinking this:
Is there a massive particle we
can now make with this energy,
with these energetic protons,
that we haven't seen before?
For the theorists, too,
it is an exciting and
nerve-wracking time
If we find supersymmetry in
experiments, for me personally
it will mean that I have not
wasted my entire research career
because this is the one question
as a young scientist
I decided had my name on it
to study
I'm starting to get nervous
You know
So there were a lot of people
who predicted
that supersymmetry was just
around the corner
or something else, that as soon
as LHC turned on
they'd see spectacular effects
on the one hand,
or that the Higgs particle would
be heavy on the other hand
Those are all wrong
Now it's make or break time
For the thousands of scientists
who have come together
in this great quest,
pushing the frontiers
of knowledge
has been a wild
rollercoaster ride
And with the Large Hadron
Collider
Three, two, one
zero
The fun has only just begun
most complex machine in history,
to probe the deepest mysteries
of the early universe,
as it was
at the beginning of time
The Large Hadron Collider is
allowing us to see right back
to ten to the minus 12 seconds
after the Big Bang
Within two massive detectors,
in conditions harsher
even than outer space,
tiny particles smash together
at nearly the speed of light
unleashing incredible energy
Trying to figure out
what happens in the collision of
two protons at very high energy
is like analyzing what happens
in the high-speed collision
of two garbage trucks
Within that spray of debris,
physicists search
for a tiny bundle of energy,
a subatomic particle
proof of an invisible energy
field that fills all of space
It just may be
the most important feature
of our universe
Without it
There are no atoms,
there's no chemistry,
there's no life
50 years of effort, $10 billion,
and thousands of researchers
around the world
For them, the stakes have
never been higher
It's practically
my whole professional life
that's led to this point
It's the moment of truth
when science flips the switch
on the Big Bang Machine
One, zero
Right now, on NOVA.
In Europe, a stunning
announcement
One of the world's
most-wanted fugitives
has finally been captured
Done!
The announcement came
at the end of a high-speed,
high-stakes chase
A mystery
300 people were hot on the trail
Decades worth of work
It was a truly
international effort
that drew to its dramatic
conclusion here
It's a historic milestone today
On the border of France
and Switzerland,
300 feet below ground
But this wasn't a search
for some outlaw
or criminal mastermind
It was a hunt for something
far more elusive
An unstable bundle of energy
far smaller than an atom
that winks out of existence
in a trillion trillionth
of a second
It's evidence of a force
that fills all of space,
completely invisible,
and yet without it,
life, earth, the universe
we know could not exist
Finding this elusive particle
marks the end of a quest
that required constructing the
largest, most complex machine
the world has ever seen
A quest that consumed nearly
half a century,
billions of dollars,
and asked thousands of
scientists across the globe
to invest years,
even decades of their careers
with no guarantee of success
I got a job to do this in 1993
It's eleventh year now
About ten years, me
Yeah, and about
five years for me
20 years, something like that
Since 1994, I guess
It's practically my whole
professional life
that's led to this point
The discovery has been hailed
as one of the greatest
scientific victories of all time
and has already won
the Nobel Prize
It's an enormous triumph
This was my generation's
Manhattan Project,
and I wanted to be on the inside
looking out
It's been extremely exciting
But what is
this mysterious quarry?
What does it actually do?
And why was finding it
so important?
That story begins at the
very beginning of time,
when the universe came into
being in a massive explosion
called the Big Bang
So here we have the Big Bang
Billions of years ago
Deserves a little bit
of color, I think
And then the timeline
of the universe
This is where we are
This now the age
of the universe,
like 13 7 billion years
after the Big Bang
And so working backwards,
we had the dinosaurs
So here's a dinosaur
Then life itself, first DNA was
about four billion years ago
Before DNA, there was the earth
Before that, the first stars
Before them, just atoms
While atoms were once thought
to consist
of just three basic particles...
Neutrons, protons
and electrons...
Physicists now know
some of these are made
of even more fundamental stuff...
The basic building blocks
of our universe
The big question then is
where did those building blocks
come from?
The answer to all that lies
in the first second
In the first instant
of existence,
when the universe was
unimaginably hot,
the cosmos was filled with
identical bundles of energy
moving at the speed of light,
all indistinguishable
from one another
But then something changed
Distinct types
of particles emerged
with different properties,
like electric charge
and mass, what we
experience as weight
Now we live in a universe
full of tangible stuff
And while that monumental shift
from nothing to something
must have happened
almost immediately,
how it happened
was one of the biggest
unanswered questions in physics
The mysteries of existence lie
within this second
Certainly we understand
the science,
we understand the physics
Work backwards into this second,
but at some point we just
run out of knowledge
And the Large Hadron Collider
is allowing us to see
right back to ten to the minus
12 seconds after the Big Bang
Beyond that, here be dragons
or dinosaurs
The Large Hadron Collider is
a massive particle accelerator,
the largest machine
in the world,
designed to simulate
the universe as it was
a trillionth of a second
after the Big Bang
To solve the mystery of mass,
it smashes protons together
at energy so high
that it is capable of testing
an idea first suggested in 1964
by several scientists
around the world,
including a young theoretical
physicist named Peter Higgs
His mathematics suggested that
right after the Big Bang,
an invisible energy field was
somehow switched on
and now fills
the entire universe
Just the way that a magnetic
field affects some materials
but not others, he suggested
that this new field
selectively affects
some fundamental particles,
causing some of them
to take on mass
Very massive particles
like the quarks that make up
protons and neutrons
interact strongly
with this field
Electrons, which form the
outer shells of atoms,
interact less strongly
and are very lightweight
And still others, like photons,
particles of light,
have no mass, because they don't
interact with the field at all
The theory implied that a
universe without a Higgs field
might not be
a very friendly place
And that got people's attention
If there were no Higgs
mechanism,
elementary particles
wouldn't have mass
If electrons didn't have mass,
that means they would move
at the speed of light
And if electrons moved
at the speed of light,
electrons do not settle down
into atoms
And if electrons do not settle
down into atoms,
there are no atoms,
there are no molecules,
there's no chemistry,
there's no life
Nothing
It would look nothing
like what we see today
We wouldn't be here,
and there would be no physicists
to ask these questions
When Higgs submitted his theory
to a journal,
the editors based at CERN
rejected it
My reaction was
that they clearly hadn't
understood what I was saying
Undeterred, he revised
the paper,
adding a paragraph saying,
in effect,
that if the field exists,
we should find evidence of it
in the form of a particle that
would turn up in an accelerator
In other words, if you smash
particles together
energetically, you'll make
a ripple in the field
And if you apply enough energy,
you just might be able to detect
it in the form of a particle
The second time around,
an American journal published
the paper
and Peter Higgs got
a lot of credit
But in reality, the idea was
cooked up independently
by a bunch of scientists:
Philip Anderson, Robert Brout,
François Englert,
Gerry Guralnik, Carl R Hagen,
Peter Higgs, Tom Kibble,
Gerard 't Hooft
Some have suggested that it
really should be called this
But since that's impossible
to pronounce,
it's simply called
the Higgs field
Gradually, the theory
gained support,
but without the evidence
of a particle,
now called the Higgs boson,
it remained unproven
To be honest, we weren't sure
that the Higgs existed
Mr Higgs and his collaborators
were saying that there was
an invisible energy field
everywhere in the universe
So the "invisible"
sounds a little odd,
and the "everywhere in
the universe" also sounds
kind of far-fetched
So that was a lot
for people to swallow
There were many people
who thought
this can't be the answer
I've heard people describe it
as a trick,
a mathematical trick to make
the equations work out
Finding something
that's all around us
is surprisingly tricky
Because the Higgs boson
doesn't actually exist
At least not in any form
that we can easily detect
So in 1998, scientists from
around the world came together
at CERN, the Center for European
Nuclear Research,
located on the border of France
and Switzerland,
to build a particle accelerator
that would have enough power
to create such a profound
disturbance in the Higgs field
that the predicted Higgs bosons
would pop into existence
and present themselves
But easier said than done
In order to find this particle,
we had to build this complex,
cutting-edge accelerator
The work is the work of
thousands of people
20 years of effort went
into building these detectors
20 years of efforts of
the international community
From dozens of nations,
with the U S contributing
$500 million
It took $10 billion
and ten years
to complete
the Large Hadron Collider,
a massive masterpiece
of engineering,
to find one of the tiniest
pieces of the cosmos
It's a very cool
and expensive eye
that can look at very,
very small distances
like about a billionth
of a billionth of a meter
We designed this machine
so that wherever the Higgs boson
would be,
we would be able to find it
Flushing the Higgs out of hiding
begins in a modest little red
bottle full of hydrogen atoms,
the smallest and most abundant
element in the universe
All the protons that we use
at CERN are taken
from a bottle that size
They start their journey here
and they continue
down this orange line, and that
is the linear accelerator
Trillions of hydrogen atoms
stripped of their electrons
are injected into the collider
Every 12 seconds
ten to the power 14 protons
are being accelerated
down that line
The protons accelerate around
larger and larger loops
until they are finally directed
into the main ring
To keep the increasingly
energetic particles confined,
the LHC relies on immensely
powerful magnetic fields
generated by 1,232 primary
superconducting magnets,
cooled to just a few degrees
above absolute zero
by 120 tons of liquid helium
After about 20 minutes
of acceleration,
each bunch of protons is moving
at nearly the speed of light,
with as much energy
as an onrushing locomotive
Finally the protons are
carefully steered
into violent head-on collisions
converting the huge energy
into showers of exotic,
energetic particles, scattering
in all directions,
many decaying into showers
of even more particles,
setting the stage for the hard
work of detecting the Higgs
Trying to figure out
what happens
in the collision of two protons
at very high energy
is like analyzing what happens
in the high-speed collision
of two garbage trucks
Garbage is spread
all over everything,
and most of it is garbage in the
sense that it's not interesting
It's old stuff
that we already knew about
And in all this garbage
that's spraying out
in all directions
on the highway,
you have to find
the golden needle,
the rare artifact that you're
looking for, the Higgs boson,
something entirely new
To the scientists at CERN,
a collection of physicists
from all over the world,
the stuff produced in these
powerful collisions
is anything but garbage
Each particle has a
well-understood identity,
described with great precision
in one of the most accurate
theories ever devised
to explain the workings
of the universe
It's called the Standard Model,
and one of its key contributors
is Frank Wilczek
Hi, welcome
Come on in
A lot of what I do
is really just play
I mean, I play
with the equations and ideas
All that playing won Frank
a Nobel Prize
for his contribution
to the Standard Model
Well, what have we got here?
It looks like an instrument
of torture for the mind
The Standard Model is
essentially an understanding
of how all the known pieces
of the universe fit together,
except for the mechanism
of gravity,
creating a mind-boggling
tapestry
This is going to be a hell
of a puzzle
to figure out
All right, now,
a promising start
We think the Standard Model
contains all you need
in principle to describe
how molecules behave,
all of chemistry, how stars
work, all of astrophysics...
Not only how things behave,
but what can exist
These are the rules of the game
The ingredients of the Standard
Model are of three basic sorts
There's what you might
broadly call matter
That's sort of lumps of stuff
that have a certain degree
of permanence
And these are,
on the one hand, quarks
They include the building blocks
of protons and neutrons
and atomic nuclei
And leptons
Most prominent lepton
in everyday life
is certainly the electron
So those are matter particles
On the other side, we have what
you might call force particles
or force mediators
Called "bosons,"
some of these particles are
more like lumps of energy
They transmit the forces
that bring the matter
particles to life
They include the photon,
which carries
the electromagnetic force;
the gluons that carry
the strong force
which holds protons
and neutrons together;
and the W and Z bosons
that are responsible
for the weak force
governing radioactivity
With just this small list
of ingredients,
the Standard Model explains
the physical properties
of the elementary building
blocks of nature
The Standard Model is just a
handful of particles and forces,
and it explains every experiment
ever done
by every human being
in the history of science
So it's quite impressive
in what it's managed to do
It explains how stars burn
It explains
how radioactivity occurs
It explains how chemistry works
It explains how light works
It's an amazing theory
The first particles were
discovered in experiments
and became the foundation
for the Standard Model
But then the theorists took over
and all the particles discovered
in the last 40 years
were first predicted
by the mathematics
of the Standard Model
and then found experimentally
The Higgs boson, a force
particle, was the last
and most challenging piece
of the puzzle
That's why finding it was such
an obsession among theorists
and experimentalists alike
In September 2008,
with much fanfare
the giant accelerator
was switched on
The LHC was ready to go to work
It was an exciting time,
full of high expectations
Designing and building
this machine,
it's just incredible to see it
come to life
But then, just nine days
after start-up
disaster struck
It was 11:00 in the morning,
and I got a call to come over,
something looks serious
And when I got over there,
I had never seen such carnage
A short circuit burned a hole
in a giant container of liquid
helium used to cool the magnets
Six tons of helium was released
into the tunnel
and more than 50 of the giant
magnets were fried
The $10 billion LHC
was dead in the water
Undaunted, engineers worked
to repair the machine
and physicists continued to
refine the computer programs
that would analyze
the vast amount of data
that the LHC would produce
once it was running
at full power
Three, two, one
By late 2009, after 14 months of
repair work and reengineering,
the LHC was more robust
than ever
and finally ready to begin
the hunt in earnest
Now, protons are whizzing
both ways around the ring
at nearly the speed of light
At the center of the two Higgs
detectors, the beams cross
inside ATLAS, a massive machine
the size of a cathedral
and also within its smaller
cousin, CMS
Even though the beams are
microscopically small,
the vast majority of particles
contained in them
whiz past each other
without incident
When you collide 100 billion
protons and 100 billion protons,
most of the protons are
just seeing each other
and going, "Hello," and going on
But about 800 million times
every second,
pairs of protons meet head-on
What's called a "hard collision"
When the proton breaks up
so it's no longer a proton,
that's an interesting collision
And that happens
only about 20 times
out of all these billions
of protons crossing
In each of these powerful
collisions,
dozens of new particles
flash into existence
and spray outward, their unique
signatures tracked
by the huge detectors,
capturing the action
40 million times a second
Incredibly fast, but still not
able to spot the Higgs directly
The Higgs is actually kind of
a difficult particle to find
It's kind of subtle
in how you look for it
As soon as you create it,
it decays very, very quickly
The lifetime of a Higgs
is about one zeptosecond,
which is like
ten to the minus 21 seconds
So, in fact,
you'll never even see it
in a particle accelerator
It doesn't move that far,
enough for you to see any track
left behind
And so, the only way to detect
the Higgs would be by spotting
the more familiar particles
that the quickly vanishing Higgs
decays into
The math predicted
about a dozen different possible
decay modes, as they're called
But the relative likelihood
of any of them
depended on the mass
of the Higgs
which was a total mystery
It must have seemed like
a cosmic joke on the theorists
The irony, if you like, is that
although the Higgs field that's
related to the Higgs boson
gives other particles mass,
the one property of the Higgs
boson that was not predicted
by Professor Higgs
and his colleagues
was the mass
of the Higgs boson itself
So its mass could have
been anything
from very, very light by our
standards to very, very heavy
Since the Higgs could
theoretically decay
in so many different ways,
the Higgs hunters had
to be willing to sift
through all
of the collision debris,
looking for slight increases
in the number
of detectable particles,
with very specific
characteristics,
into which the Higgs could
possibly decay
So it's not like looking
for a needle in a haystack,
when at least you know
that you found a needle
It's like looking for hay
in a haystack
You're looking for a little bit
more hay with certain properties
than certain other properties
That daunting challenge meant
building enormously
complicated detectors
to track and count
every bit of debris
coming out of those collisions
And then we have to somehow,
with all of the particles
that come out of this event,
we have to reconstruct them and
find if there are new particles
that are happening
The mathematics predicts that
the Higgs should often decay
into particles that are also
maddeningly hard to detect...
Like quarks, the particles that
make up protons and neutrons
in the nuclei of atoms
They looked in every
possible way they can look
In the end,
they looked for the Higgs boson
decaying into photons
Out of every thousand
Higgs bosons created,
a few should decay in a way that
produces a pair of photons...
Light particles
which can be measured very
precisely in the detectors
By knowing the energy and angle
between pairs of photons,
scientists can tell if they
were likely produced by a Higgs
And by looking for unexpectedly
high concentrations
of certain photons
over billions of collisions,
scientists hoped to zero in on
the Higgs and, as a consequence,
pinpoint its exact mass...
The one missing value
in the theory
It proved to be a statistical
sifting process
of dizzying complexity
Luckily, they had a head start
Years of experiments in other
colliders had ruled out
many possible masses
for the Higgs,
measured in units called
gigaelectronvolts, or GEV
So on this line of what the mass
of the Higgs might be,
we can draw on what previous
experiments have
have tried and where
they've been able
to exclude it from being
A less powerful accelerator,
the LEP Collider at CERN,
a predecessor of the LHC,
had already ruled out the Higgs
being at the bottom end
of potential masses
In fact they were able to say
that the mass of the Higgs
is, with 95% confidence,
114 GEV or more
So after LEP, the next major
milestone in the
in the Higgs search was limits
set by another collider
in the US, the Tevatron
The Tevatron was able to exclude
a range here around 160 GEV here
In 2011, CERN moved that upper
boundary still lower
The LHC has been able to rule
out a big region
from 145, quite far up
But this last remaining
energy range
was also the trickiest to search
It's the area in which the
unique signature of the Higgs
would be mostly deeply buried
under the background noise
of other particles
created in the collider
If I was to bet,
I would probably
put it at 130 GEV
Probably somewhere around
120 GEV
Somewhere between 120
and 130 GEV
114 GEV because it's the most
difficult place to look
and we haven't found it yet
Ah, that's a good question,
because you know you are
assuming that the Higgs
actually exists, which I'm-I'm
starting to believe
it probably does not exist
As data piled up at the LHC,
scientists narrowed the range
even further
It seemed that they were either
about to close in
on the Higgs particle or prove
that it didn't exist at all
People were beginning to worry
a little bit
that we hadn't found
the Higgs yet
and maybe weren't going
to find it
And that would've been
a complete shock
because we know that something
is doing the job of the Higgs
You start to get a little
nervous
because either it's there
or there isn't a Higgs boson
at all
By the end of 2011, the window
narrowed even further
The LHC, with the new data
from the whole of 2011,
is able to expand the area that
it can exclude the Higgs from
The new lower limit had risen
to 115 GEV,
and the new upper limit dropped
to 127 GEV
And within that range,
interesting things were showing
up in the data
So the really exciting thing
was that the reason the LHC
experiments weren't able
to exclude anything inside
this remaining window
is that in fact they see
an excess of events,
the early signs of the
Higgs boson, if it's there
An excess of events means
that the LHC was producing
more particles of interest...
In particular, pairs of photons
So, what you're looking for is
called a bump
because at that
particular energy,
you should see a lot more decays
if there is a Higgs boson
So if you see a bump, that's a
clue that something's going on
Those excess photon pairs were
showing up in not just one
but in both detectors, and at
practically the same mass
CMS was seeing a spike
in the number of photons
which could be the signal of a
Higgs with a mass of 124 GEV
And ATLAS was seeing a
similar spike near 125
Now with the hunt finally
closing in,
the LHC continued smashing
protons,
sorting through the debris
and piling up the data
for another six months
We saw a signal growing, growing
every week, every day
Until at last, on July 4, 2012,
the heads of ATLAS and CMS,
Fabiola Gianotti and
Joe Incandela, called a meeting
Two presentations from the two
experiments, ATLAS and CMS
There to hear the news
firsthand: Peter Higgs himself
It was standing room only
Good afternoon,
everybody in Melbourne
But it was also beamed live
around the world
So, of course,
everyone's heard lots of rumors
at this point,
within the collaborations
But there are these two
collaborations,
the CMS collaboration and
the ATLAS collaboration
And we aren't supposed to know
what they have, and I didn't
You know, you'd heard stories,
but I hadn't seen their data
So that's kind of exciting
So, today is a special day on a
search for a certain particle
But no one was quite prepared
for the short, definitive
announcement that was to come
And I ask Joe Incandela from CMS
to take the floor
This was about to become one of
the defining moments
in the history of physics
and science
And the energy was so incredible
It was like a big party
People were really excited
And it was just then I think
I started to really appreciate
where we were and that this was
a major discovery
This slide shows you one event
taken just a few weeks ago
I put the slide up and before
I could say anything,
there was a gasp
across the whole audience
Now, a major result like this
from one experiment
could still be wrong
Now we go immediately to ATLAS
Fabiola Gianotti, please
Thank you
But Fabiola brought the same
confidence for her results
You can already see here
the compatibility between
what we observed: one big spike,
here in this region here
If you look at these plots
that were shown,
first thing you want to see is
did CMS and ATLAS find the bump
in the same place?
And in fact they had
An excess at a mass of 126 5 GEV
Both teams had found an excess
of photons
pointing to the same mass
And that was pretty convincing
So you're going,
"Wow," like, "we rock"
As a layman I would now say
I think we have it
You agree?
The LHC had found
the Higgs particle
We have observed a new particle
consistent with a Higgs boson
It's like running a marathon
Suddenly you realize you crossed
the finish line
Maybe one more round of applause
to all the guys
who took part in the project
for more than 25 years
It comes as a big surprise
to me, I must say
I went into that seminar
expecting good results
But I was gobsmacked,
as they say
The hunt that spanned
half a century was over
The Higgs boson hid for 50 years
But, you know, like they said
with the Canadian Mounties,
"They'll get their man"
It could run,
but it couldn't hide forever
It appeared Higgs and his
colleagues had been right
The mystery of how particles
gain mass had been solved
The last piece of the Standard
Model had been found
For me it's really
an incredible thing
that it's happened
in my lifetime
I had the pleasure
to meet Peter Higgs
at the end of the seminar
and exchange a hug
He told me,
"Congratulations to you
and your experiment
for this incredible achievement"
And of course, I replied,
"Congratulations to you!
You are the first person to be
congratulated"
I think it's not appropriate
for me to answer
any detailed questions
at this stage
This is an occasion celebrating
an experimental achievement
and I simply congratulate
the people involved
Ironically, the achievement took
place at the very same institute
where nearly 50 years earlier,
an editor had rejected Higgs'
initial paper
The Royal Swedish Academy
of Sciences
In a fitting end to the saga,
Peter Higgs and Belgian
physicist François Englert,
who had independently come up
with the idea
for the Higgs field,
won the 2013 Nobel Prize
Englert's colleague,
Robert Brout,
certainly would have been
honored as well
had he lived to see the day
So why is all this important?
Why does proving the existence
of the Higgs field matter?
Building an enormous Big Bang
machine to recreate conditions
in the universe near
the beginning of time
and completing
the Standard Model
is a tremendous scientific
achievement
Finding the Higgs sheds light
on all of particle physics
and cosmology
It's all connected
All our models of how the
universe began, how it expanded,
everything, is, you know,
affected by the Higgs field
and by how we understand
the universe
Perhaps discovering the Higgs
boson and the field it proves
will open new doors
The discovery of the Higgs
is just the first step
In science you make
a step forward...
You answer a question, but then
other questions open up
into even greater mysteries
that still remain
beyond the Standard Model
The Standard Model can't be
the final thing
There is something beyond the
Standard Model; we know that
Hopefully the Higgs can give us
some guidance in that direction
Yes, we do know
the Standard Model works
It works incredibly well
But we know it's not
the whole story
And any time in the history
of physics
where people thought they had
the whole story they were wrong
And so we're looking for what
is the next piece,
not just in terms
of one particle
but in terms of forces, in terms
of understanding nature
The number of mysteries in
the Standard Model is huge,
which is fine because,
as a scientist,
I'm drawn to mysteries
One mystery that the
Standard Model can't answer
is perhaps the most fundamental
of them all
Why isn't our universe empty?
Because according
to the mathematics
behind the Standard Model,
it should be
Science has given us a set of
laws that describe the world
so accurately that we can
predict the motion of a coin
tossed in the air because we
understand the law of gravity
We understand electromagnetism
so well
that we can use our GPS
satellites to locate your car
to within a few inches
And we understand
the nuclear force so well
that we can predict the future
evolution of the sun itself
Those mathematical equations
that work so well
to describe the laws
of the physical world
are bound together by something
that we see around us every day
Something that characterizes
our faces
and the natural world
even the tiniest structures
like viruses and our DNA...
Symmetry
In the Standard Model,
symmetry rules
The laws are dictated, really,
in their form
by requiring tremendous amounts
of symmetry
That's how we found them
The equations of the Standard
Model seem to predict a universe
in perfect balance, formless
and without structure
as it was at the very beginning
And if it had remained that way,
nothing would exist
If the laws of science are
framed in their most perfect,
most symmetrical form,
then life cannot exist at all
There'd be no mountains, rivers,
valleys,
no DNA, no people, nothing
A universe created along
absolutely symmetric principles
would be in perfect balance
The Higgs field is the first
clue to what broke the symmetry
of that completely uniform
early universe
The state of perfect symmetry
is very similar
to the state of perfect balance
Think of a spinning top
It exists in a state of
perfect rotational symmetry
No matter how you rotate,
everything looks the same
Even more so than the symmetry
of a spinning top,
at this instant of creation,
every place in the universe
would have been symmetrical,
identical to every other place
But perfection isn't stable
The slightest imperfection,
the slightest little defect
will cause it to vibrate,
perturb,
and fall to a lower energy state
Symmetry has been broken
Within a fraction of a second
of the Big Bang,
physicists believe the absolute
symmetry of the universe
was shattered
by a tiny fluctuation
The Higgs field appeared
in all of space
The forces split apart
The particles of the Standard
Model became distinct
Structure emerged
This fall from perfection
was what allowed us
to come into being
Everything we see around us
is nothing but fragments
of this original perfection
Whenever you see a beautiful
snowflake, a beautiful crystal,
or even the symmetry of stars in
the universe, that's a fragment
That's a piece of
the original symmetry
at the beginning of time
Finding and studying the Higgs
is a vital first step
in the quest to understand
that early state
when the particles that make up
what we can perceive
came into being, as well
as a much greater quantity
of mysterious stuff
that we know is out there
but that we can't directly
detect, called dark matter
What are these missing pieces?
When James Gates came
to study at MIT,
he was determined to unlock the
secrets of the early universe
and understand what happened to
the unity that was once there
The universe and we are
intricately tied together
This idea of unity
turns out to be
one of the most powerful
driving themes in physics
and it keeps getting us to look
for deeper and deeper
connections
So ultimately, perhaps, we exist
because the universe
had no other choice
He looked at the Standard Model,
the matter particles and the
bosons, the force particles,
that hold everything together
He wondered if these two groups
of particles
that seem so different
could be related
in some profound and hidden way
This question...
Why is there a fundamental
asymmetry of forces and matter...
Led him to a powerful
mathematical theory
called supersymmetry
It was the asking
of this "what if?" question
that drove the construction
of supersymmetry,
which had an incredible
resonance for me
when I was a graduate student
I saw one more beautiful balance
that we could put in nature
One of the pioneers
of supersymmetry,
Jim Gates saw in the mathematics
a possible hidden world
of new particles
no one had suspected
Mathematics leads us to find
things we didn't know
were there before
Supersymmetry is an example
of that
We know about ordinary matter
The mass leads you on
to discover supermatter
and superenergy
The theory gives every matter
particle a force partner
and every force particle
a matter partner
These heavier supersymmetric
twins are labeled sparticles
So once you believe this math
that says there's
more to existence,
then you have to wonder what
these other things are
You have to name them, at a very
you know, at the very first step
So in nature there is a thing
called the electron
The math says it has
a superpartner
called the selectron
Muon, it'd have to be a smuon;
photon, there'd have to be a
photino;
quark, there'd have to be
squarks;
Z particle, there'd have
to be zino;
the W particle,
there'd have to be a wino
And that's how supersymmetry
works
According to supersymmetry,
matter and forces aren't
so distinct after all
There's a grand symmetry
between them
but we can currently see only
one partner from each pair
However strange it seems,
this theory has gained
widespread support
from theoretical physicists
Not just for the beauty
of its equations
but for what it might
help explain
When supersymmetry began
as a topic of discussion,
no one realized what it can do
It turns out that studying
the mathematics,
we get a firm foundation
for the existence of everything
Supersymmetry could shed light
on dark matter...
The missing particles
that aren't included
in the Standard Model...
And even help to explain
how symmetry was broken
in the first place
I very much want supersymmetry
because it's a beautiful thing
by any standard
and would take our understanding
of nature to a new level
So I want that
Finding the Higgs pushed
the LHC to the limit
of what it could do
So, a few months after
the Higgs announcement
the scientists at CERN shut down
the giant collider
and began a planned
two-year upgrade
As it begins its second act,
it will smash protons
even more energetically
So when the LHC turns back on
in 2015,
we will be at twice the energy
we were before
The increased power will help
physicists to study the Higgs
with more precision, but the
real hope is that they will find
something entirely new
Every single experimentalist
is only thinking this:
Is there a massive particle we
can now make with this energy,
with these energetic protons,
that we haven't seen before?
For the theorists, too,
it is an exciting and
nerve-wracking time
If we find supersymmetry in
experiments, for me personally
it will mean that I have not
wasted my entire research career
because this is the one question
as a young scientist
I decided had my name on it
to study
I'm starting to get nervous
You know
So there were a lot of people
who predicted
that supersymmetry was just
around the corner
or something else, that as soon
as LHC turned on
they'd see spectacular effects
on the one hand,
or that the Higgs particle would
be heavy on the other hand
Those are all wrong
Now it's make or break time
For the thousands of scientists
who have come together
in this great quest,
pushing the frontiers
of knowledge
has been a wild
rollercoaster ride
And with the Large Hadron
Collider
Three, two, one
zero
The fun has only just begun