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Inside the Massive Upgrade Transforming the Large Hadron Collider · The Quark Side - Quantum Physics Podcast

• 0:01
  Speaker 1: Welcome to the quart Side Quantum Physics Podcast, an exploration
• 0:05
  Speaker 1: of the fundamental structure of reality where quantum laws govern matter, energy,
• 0:11
  Speaker 1: and information. Here, uncertainty is a feature, not a flaw,
• 0:16
  Speaker 1: and understanding begins at the smallest scales.
• 0:27
  Speaker 2: I want you to picture something deep underground. Right on
• 0:31
  Speaker 2: the border between France and Switzerland. There is this circular
• 0:35
  Speaker 2: tunnel like twenty seven kilometers long, and right now inside
• 0:40
  Speaker 2: that tunnel, the absolute largest and I mean the most
• 0:43
  Speaker 2: complex scientific instrument in human history is completely silent.
• 0:47
  Speaker 3: Yeah. It's a pretty eerie visual. I mean, it's a
• 0:49
  Speaker 3: machine built to recreate the primordial conditions of the Big Bang. Yeah,
• 0:53
  Speaker 3: and it's just powered down, sitting quietly in the freezing dark.
• 0:57
  Speaker 2: And it's not just taking a quick breather. Right at
• 1:00
  Speaker 2: this very moment, thousands of scientists and engineers are physically
• 1:03
  Speaker 2: dismantling one point two kilometers of this behemoth, right.
• 1:07
  Speaker 3: They are ripping out massive, highly complex components.
• 1:09
  Speaker 2: Yeah, the Large Hadron Collider is in a long shutdown
• 1:12
  Speaker 2: and they are not going to flip the switch back
• 1:14
  Speaker 2: on until around twenty thirty.
• 1:15
  Speaker 3: Which is just a staggering commitment of time and capital
• 1:18
  Speaker 3: not to mention human energy exactly.
• 1:20
  Speaker 2: So our focus today is to figure out the fundamental
• 1:23
  Speaker 2: logic driving this massive operation, like why are thousands of
• 1:26
  Speaker 2: the world's most brilliant minds tearing apart the very machine
• 1:30
  Speaker 2: that famously discovered the Higgs boson back in twenty.
• 1:33
  Speaker 3: Twelve, Right, And more importantly, how this upgrade, which will
• 1:37
  Speaker 3: transform it into the high Luminosity Large Hadron Collider or
• 1:41
  Speaker 3: hl LHC, is actually engineered to unlock the universe's most
• 1:46
  Speaker 3: stubborn mysteries.
• 1:47
  Speaker 2: Because you know, it's a fascinating pivot in modern physics.
• 1:51
  Speaker 2: The immediate question anyone looking at a multi billion dollar
• 1:54
  Speaker 2: shutdown has to ask, is, well, if the LHC already
• 1:58
  Speaker 2: achieved its main goal by finding the Higgs, why risk
• 2:01
  Speaker 2: gutting its infrastructure? Right?
• 2:03
  Speaker 3: That is the exact skepticism anyone looking at the budget
• 2:06
  Speaker 3: would have back in twenty twelve. Discovering the Higgs boson
• 2:09
  Speaker 3: was this massive global rockstar.
• 2:12
  Speaker 2: Moment because it confirmed the mechanism that gives elementary particles
• 2:16
  Speaker 2: their mass, right exactly.
• 2:17
  Speaker 3: It was a huge triumph the standard model.
• 2:20
  Speaker 2: But I think the natural assumption for most people, myself included,
• 2:23
  Speaker 2: is that if we want to answer the questions that
• 2:25
  Speaker 2: the Higgs didn't solve.
• 2:26
  Speaker 4: We just need a bigger.
• 2:27
  Speaker 3: Hammer, how we think about it.
• 2:28
  Speaker 2: Yeah, Like, if we want to find new particles, shouldn't
• 2:30
  Speaker 2: we just smash things together with vastly more energy. If
• 2:33
  Speaker 2: a twenty seven kloumder ring isn't enough, just build a one
• 2:35
  Speaker 2: hundred kilometer ring, pump more voltage in and hit the
• 2:38
  Speaker 2: protons harder.
• 2:39
  Speaker 3: Well, that is the intubitive leap. Most people make the
• 2:42
  Speaker 3: sort of brute force approach to particle physics, but scaling
• 2:46
  Speaker 3: up energy actually produces diminishing returns for the specific precision
• 2:52
  Speaker 3: measurements we need right now. I really, Yeah, the goal
• 2:55
  Speaker 3: of dismantling the LHD isn't to achieve significantly higher collide energy.
• 3:00
  Speaker 3: The energy will actually remain largely the same.
• 3:03
  Speaker 2: Okay, so then what's the point.
• 3:05
  Speaker 3: The entire point of this upgrade is to achieve vastly.
• 3:09
  Speaker 2: More volume volume, meaning we're just doing the exact same thing,
• 3:13
  Speaker 2: but like a lot more often.
• 3:15
  Speaker 3: Exactly, we are no longer hunting for something as glaringly obvious.
• 3:18
  Speaker 3: And I use that term very relatively for particle physics,
• 3:22
  Speaker 3: as the original Higgs.
• 3:23
  Speaker 4: Boson right obviously relative?
• 3:24
  Speaker 3: Yeah, so the scientific community is now hunting for incredibly
• 3:27
  Speaker 3: subtle clues. They're looking for tiny, almost imperceptible deviations in
• 3:32
  Speaker 3: how the Higgs couples are basically interacts with other particles. Okay,
• 3:37
  Speaker 3: because if the Higgs deviates even a fraction of a
• 3:39
  Speaker 3: percent from our current mathematical models, it can finally provide
• 3:42
  Speaker 3: a foothold to explain these mysteries that keep physicists to
• 3:45
  Speaker 3: wake at night.
• 3:46
  Speaker 2: Right, mysteries like dark matter and we know it makes
• 3:48
  Speaker 2: up most of the mass of the universe, and we
• 3:50
  Speaker 2: still have no tangible idea what it actually is.
• 3:53
  Speaker 3: Exactly, or you know the Buryon asymmetry of the.
• 3:56
  Speaker 4: Universe, which is what exactly?
• 3:58
  Speaker 3: Well, it's the question of why realities filled with matter
• 4:01
  Speaker 3: but almost entirely devoid.
• 4:04
  Speaker 2: Of antimatter, Oh right, because there should be equal amounts,
• 4:07
  Speaker 2: right in theory.
• 4:08
  Speaker 3: Yes, our current mathematical framework just doesn't offer a satisfactory
• 4:13
  Speaker 3: explanation for that imbalance. But a slight anomaly in the
• 4:17
  Speaker 3: behavior of the Higgs boson could be the thread that
• 4:21
  Speaker 3: sort of unravels the entire sweater I see. And to
• 4:23
  Speaker 3: find those microscopic anomalies, you don't need a harder smash.
• 4:27
  Speaker 3: You just need an exponentially larger data set To achieve
• 4:29
  Speaker 3: statistical significance.
• 4:31
  Speaker 2: You need millions upon millions more smashes, precisely, which brings
• 4:35
  Speaker 2: us to the high luminosity part of the hl LH supgrade. Now,
• 4:39
  Speaker 2: when I hear luminosity, I immediately think of it like
• 4:42
  Speaker 2: a really bright led bowl.
• 4:44
  Speaker 3: Right, Yeah, that's the common association.
• 4:46
  Speaker 2: But in physics, luminosity refers to the sheer density and
• 4:49
  Speaker 2: frequency of proton collisions, doesn't.
• 4:50
  Speaker 3: It It does. Yes, The upgrade is engineered to basically
• 4:54
  Speaker 3: increase the collider's luminosity by a factor of up to
• 4:57
  Speaker 3: seven over its operational lifetime.
• 4:59
  Speaker 2: Wow, but wait, how do you actually achieve that? I mean,
• 5:02
  Speaker 2: if the tunnel isn't getting any bigger and the protons
• 5:05
  Speaker 2: aren't moving any faster than they already were, which is
• 5:08
  Speaker 2: already pretty much the speed of light, how do you
• 5:11
  Speaker 2: squeeze seven times more collisions into the same.
• 5:13
  Speaker 3: Space You upbraide the magnets magnets, Yeah, but not just
• 5:17
  Speaker 3: any magnets. They get that higher luminosity. They were replacing
• 5:21
  Speaker 3: the focusing magnets near the collision points with these advanced
• 5:25
  Speaker 3: superconducting quadrupoles made of a niobium tin compound niobium ten.
• 5:31
  Speaker 2: How does that change the game compared to what was
• 5:33
  Speaker 2: in there before.
• 5:34
  Speaker 3: Well, the previous magnets use niobium titanium, and niobium tin
• 5:39
  Speaker 3: can actually carry a significantly higher electrical current without losing
• 5:43
  Speaker 3: its super conductivity, which allows it to generate a much
• 5:46
  Speaker 3: stronger magnetic field.
• 5:48
  Speaker 2: Now, imagine you're trying to shoot two needles at each
• 5:50
  Speaker 2: other from across the stadium so that their tips perfectly collide.
• 5:53
  Speaker 3: That sounds literally impossible, right, It's incredibly hard. But with
• 5:57
  Speaker 3: these new niobium tin magnets, physicists can take a bundle
• 6:01
  Speaker 3: of say one hundred billion protons and squeeze them into
• 6:05
  Speaker 3: a microscopic, ultra dense ribbon before they cross paths with
• 6:10
  Speaker 3: another bundle coming the other way.
• 6:12
  Speaker 2: Wow.
• 6:12
  Speaker 3: And obviously the tighter the squeeze, the higher the probability
• 6:16
  Speaker 3: that these protons will physically strike each other.
• 6:18
  Speaker 2: So they are essentially just increasing the density of the
• 6:20
  Speaker 2: traffic jam.
• 6:21
  Speaker 3: That's exactly it. That intense squeeze is going to result
• 6:24
  Speaker 3: in up to two hundred simultaneous proteon proton interactions every
• 6:29
  Speaker 3: single time those particle beams cross inside the detectors.
• 6:32
  Speaker 2: Two hundred simultaneous collisions in a space smaller than a
• 6:36
  Speaker 2: grain of sand. I mean the data output from that
• 6:38
  Speaker 2: must be completely unmanageable.
• 6:40
  Speaker 3: It is a terrifying amount of data. Honestly, we are
• 6:43
  Speaker 3: talking about pile up on just an unprecedented scale. Why
• 6:46
  Speaker 3: but they need every single bite of it? Why just
• 6:48
  Speaker 3: for the statistics, because the specific phenomena they are hunting
• 6:51
  Speaker 3: for are mathematically incredibly rare. For example, they are really
• 6:55
  Speaker 3: desperate to observe the rare decay of a Higgs boson
• 6:58
  Speaker 3: into two muons.
• 6:59
  Speaker 2: Okay, let's dig into that for a second. We know
• 7:02
  Speaker 2: muons are second generation leptons, but why is the Higgs
• 7:05
  Speaker 2: decaying into them so crucial? Like what exactly breaks in
• 7:09
  Speaker 2: the rule book if that specific interaction is off by
• 7:12
  Speaker 2: a tiny margin.
• 7:13
  Speaker 3: It basically comes down to how mass is distributed. According
• 7:17
  Speaker 3: to the rules, the heavier particle is the stronger the
• 7:19
  Speaker 3: Higgs field should grip. It makes sense, and we already
• 7:22
  Speaker 3: know the Higgs interact strongly with the heaviest particles like
• 7:25
  Speaker 3: the top quark, but muons are much lighter. Okay, So
• 7:29
  Speaker 3: watching a Higgs decay into two muons tests the linearity
• 7:33
  Speaker 3: of this relationship. It verifies if the Higgs interacts with
• 7:36
  Speaker 3: lighter second generation particles using the exact same underlying mechanism,
• 7:40
  Speaker 3: or if there's some unknown secondary force at play.
• 7:43
  Speaker 2: So it's essentially a stress test for the architecture of reality.
• 7:47
  Speaker 3: Yeah, that's a good way to put it. And there
• 7:49
  Speaker 3: are even more grueling tests on the horizon. Take the
• 7:52
  Speaker 3: decay of the Higgs into charm quarks, for example, charm
• 7:54
  Speaker 3: Quarke's right. Measuring this is notoriously difficult, not just because
• 7:59
  Speaker 3: it's eatingly rare, but because charmquirks are buried under this
• 8:03
  Speaker 3: overwhelming avalanche of ordinary background.
• 8:06
  Speaker 2: Noise, just general particle chaos exactly.
• 8:09
  Speaker 3: Notice QCD background.
• 8:10
  Speaker 2: It's the old needle in a haystack problem, but the
• 8:14
  Speaker 2: haystack is made of like smaller, slightly less interesting needles.
• 8:18
  Speaker 3: That is a perfect analogy. And to extract that specific
• 8:22
  Speaker 3: charm cork decay from the chaos requires that massive factor
• 8:26
  Speaker 3: of seven increase in data we talked about, right, the
• 8:28
  Speaker 3: sheer volume. Yeah, the volume allows them to mathematically subtract
• 8:32
  Speaker 3: the background noise, and any deviation they find in that
• 8:35
  Speaker 3: coupling could be the smoking gun evidence that entirely new
• 8:39
  Speaker 3: particles are influencing the Higgs from behind the scenes, like.
• 8:42
  Speaker 4: Through quantum loops exactly.
• 8:44
  Speaker 2: Finding these rare decays clearly justifies a massive engineering effort.
• 8:47
  Speaker 2: But spotting a charm cork decay really just tells us
• 8:50
  Speaker 2: how the Higgs interacts with other particles, right, right, That
• 8:53
  Speaker 2: still doesn't tell us how the Higgs feel behaves in isolation.
• 8:56
  Speaker 2: I mean to find that out, we can't just look
• 8:58
  Speaker 2: at a single Higgs boson. We have to talk about
• 9:01
  Speaker 2: what seems like the holy grail of this twenty thirty run,
• 9:05
  Speaker 2: which is the search for Higgs boson pairs.
• 9:07
  Speaker 3: Yes, die Higgs production.
• 9:09
  Speaker 2: Right, Observing two Higgs bosons appearing from a single collision.
• 9:13
  Speaker 3: Which is a process about a thousand times rarer than
• 9:15
  Speaker 3: producing a single Higgs.
• 9:16
  Speaker 4: Wow, a thousand times rarer.
• 9:19
  Speaker 2: Why does seeing two of them at once matter so
• 9:21
  Speaker 2: much more? What fundamental question does a pair of Higgs
• 9:24
  Speaker 2: bosons answer?
• 9:25
  Speaker 3: Well, observing these pairs is the only direct way experimental
• 9:29
  Speaker 3: physicists can measure what's called Higgs self coupling.
• 9:31
  Speaker 4: Okay, self coupling.
• 9:33
  Speaker 3: Yeah, we have to remember that the Higgs isn't just
• 9:35
  Speaker 3: a physical particle, right, It is an invisible field that
• 9:38
  Speaker 3: permeates all of space. The particle we see is just
• 9:40
  Speaker 3: a ripple in that field, right right, So, Higgs self
• 9:43
  Speaker 3: coupling measures the strength with which this universal field basically
• 9:47
  Speaker 3: interacts with itself.
• 9:48
  Speaker 2: I am trying to visualize a field interacting with itself.
• 9:52
  Speaker 2: How does that practically impact the universe? Like? Why does
• 9:54
  Speaker 2: it matter?
• 9:55
  Speaker 3: Think of it in terms of potential energy? The self
• 9:58
  Speaker 3: coupling strength is essentially determines the fundamental shape of the
• 10:02
  Speaker 3: Higgs field. In physics, we often visualized this shape as
• 10:06
  Speaker 3: a Mexican hat potential.
• 10:08
  Speaker 2: A Mexican hat like a sombrero.
• 10:11
  Speaker 3: Yeah, exactly. So the center of the hat, the peak,
• 10:14
  Speaker 3: is a state of high energy, and the brim around
• 10:16
  Speaker 3: the bottom is the lowest energy state, or what we
• 10:19
  Speaker 3: call the vacuum expectation value.
• 10:21
  Speaker 4: Okay, I'm with you.
• 10:22
  Speaker 3: When the universe was born in the Big Bang, the
• 10:24
  Speaker 3: Higgs field basically sat at the high energy peak in
• 10:27
  Speaker 3: the very center. As the universe expanded and cooled, the
• 10:31
  Speaker 3: field rolled down the slope of that hat into the brim,
• 10:34
  Speaker 3: settling into a stable state.
• 10:36
  Speaker 2: And that rolling down process is what triggered the sudden
• 10:39
  Speaker 2: assignment of mass to all the particles in the universe.
• 10:42
  Speaker 3: Right, Yes, exactly, that phase transition allowed matter to stabilize
• 10:46
  Speaker 3: and you know, stars, galaxies, and eventually humans to form.
• 10:49
  Speaker 4: Okay, that's wild.
• 10:51
  Speaker 3: It is. But here is the really critical part. The
• 10:55
  Speaker 3: self coupling strength determines the exact steepness of those slopes
• 10:59
  Speaker 3: on the mat can hat. If the self coupling measurement
• 11:02
  Speaker 3: at the hl LHC comes back different than predicted, it
• 11:06
  Speaker 3: means the slopes are either steeper or shallower than we thought.
• 11:09
  Speaker 2: Which means the cooling of the early universe happened entirely differently.
• 11:12
  Speaker 3: Precisely, it could imply that the phase transition wasn't just
• 11:15
  Speaker 3: a smooth roll down the hill, but rather a really
• 11:18
  Speaker 3: violent bubbling transition, like water boiling. Exactly a first order
• 11:22
  Speaker 3: phase transition. And if the early universe boiled violently like that,
• 11:26
  Speaker 3: it provides the exact out of equilibrium conditions necessary to
• 11:29
  Speaker 3: explain why matter survived and anti matter was wiped out.
• 11:33
  Speaker 2: Wow. So by measuring Higgs pears today, we are quite
• 11:36
  Speaker 2: literally trying to map the architectural ship of the universe
• 11:39
  Speaker 2: moments after it was born.
• 11:41
  Speaker 3: Yeah, that's exactly what they're trying to do.
• 11:42
  Speaker 2: Okay, So to capture all of this, we are upgrading
• 11:46
  Speaker 2: this machine to smash ultra dense proton ribbons together, creating
• 11:51
  Speaker 2: two hundred simultaneous collisions, searching for incredibly rare decays and
• 11:55
  Speaker 2: die Higgs pears, all to figure out if the blueprint
• 11:59
  Speaker 2: of the early universe is correct.
• 12:01
  Speaker 3: That's the summary, yes, But.
• 12:02
  Speaker 2: Physically, logistically, how do you even manage that environment? I mean,
• 12:06
  Speaker 2: if you have two hundred distinct quantum explosions happening in
• 12:10
  Speaker 2: the space of a grain of sand, doesn't the radiation
• 12:13
  Speaker 2: from that completely fry any sensor you put near it?
• 12:16
  Speaker 3: Oh? Absolutely? That is actually the ultimate engineering hurdle.
• 12:20
  Speaker 4: Here, I would imagine.
• 12:21
  Speaker 3: Yeah, the radiation environment at the center of the ATLAS
• 12:23
  Speaker 3: and CMS experiments is going to be incredibly hostile. As
• 12:27
  Speaker 3: high energy hadrons fly out from these collisions, they literally
• 12:30
  Speaker 3: knock silicon atoms out of their crystallattice inside the detectors.
• 12:34
  Speaker 2: Just physically breaking the material.
• 12:36
  Speaker 3: Yes, they create structural damage or what we call traps
• 12:39
  Speaker 3: that capture electrical signals and degrade the data.
• 12:42
  Speaker 2: So the machine essentially blinds itself over time.
• 12:45
  Speaker 3: Right. So to counteract this, the engineering teams aren't just
• 12:48
  Speaker 3: tweaking old designs. They are deploying entirely new three D
• 12:53
  Speaker 3: silicon sensor geometries.
• 12:55
  Speaker 2: Three D silicon. How is that different from normal sensors.
• 12:58
  Speaker 3: Well, instead of planar sensors where the electrodes just sit
• 13:01
  Speaker 3: flat on the surface, these new detectors feature electrodes that
• 13:05
  Speaker 3: are etched directly through the silicon bulk as columns. Oh
• 13:08
  Speaker 3: I see, which means the electrical signals don't have to
• 13:11
  Speaker 3: travel as far through the damaged silicon to be read out.
• 13:14
  Speaker 4: That's really clever it is.
• 13:16
  Speaker 3: Combine that with massive cooling systems dropping the operating temperatures
• 13:20
  Speaker 3: down to minus thirty degrees celsius to mitigate thermal noise,
• 13:24
  Speaker 3: and you have a sensor that can actually survive the radiation. Brash.
• 13:27
  Speaker 2: Okay, but even if the sensor survive the radiation, you
• 13:29
  Speaker 2: are still left with the problem of deciphering the data. Right,
• 13:32
  Speaker 2: you have two hundred different collisions overlapping. How on earth
• 13:36
  Speaker 2: do you untangle that incredibly dense web of particles without
• 13:40
  Speaker 2: completely losing your mind?
• 13:42
  Speaker 3: You introduce a fourth dimension to particle.
• 13:44
  Speaker 2: Tracking precision timing. I was reading about this and it
• 13:48
  Speaker 2: absolutely blew me away. They are adding time as a
• 13:51
  Speaker 2: distinct variable to filter the chaos.
• 13:53
  Speaker 3: It is a profound innovation because even though those two
• 13:56
  Speaker 3: hundred proton proton collisions are happening almost simultaneously during a
• 14:01
  Speaker 3: bean crossing, they do not happen that the exact same
• 14:04
  Speaker 3: mathematical instant.
• 14:05
  Speaker 2: Right, There has to be some lag, exactly, Yeah.
• 14:07
  Speaker 3: There are infinitesimally small differences in timing as the pro
• 14:10
  Speaker 3: con bunches sort of slide through each other.
• 14:12
  Speaker 2: We are talking about differences on the scale of pico seconds, right,
• 14:15
  Speaker 2: like trillions of a second.
• 14:17
  Speaker 3: Tens of pico seconds. Yeah. And to handle this, experiments
• 14:21
  Speaker 3: like Atla's are installing completely new subsystems, like the high
• 14:25
  Speaker 3: granularity timing.
• 14:25
  Speaker 4: Detector, which does what exactly.
• 14:28
  Speaker 3: Use a specialized silicon technology, specifically low gain avalanche detectors,
• 14:32
  Speaker 3: which multiply the initial electrical signal created by a passing
• 14:36
  Speaker 3: particle to give a razor sharp timestamp.
• 14:38
  Speaker 2: I was trying to conceptualize just how precise a ten
• 14:41
  Speaker 2: pico second time stamp is.
• 14:43
  Speaker 3: It's hard for the human brain to grasp awestly.
• 14:46
  Speaker 2: Right, So imagine you are standing in the middle of
• 14:48
  Speaker 2: a massive stadium completely packed with screaming fans, the roar
• 14:53
  Speaker 2: of the crowd is deafening. Okay, that roar represents the
• 14:56
  Speaker 2: background radiation and all the overlapping ordinary particle interactions the
• 15:01
  Speaker 2: pile up.
• 15:02
  Speaker 3: Sure.
• 15:03
  Speaker 2: Now imagine being able to isolate a single quiet whisper
• 15:07
  Speaker 2: from someone in the very back row, not based on volume,
• 15:11
  Speaker 2: but simply because you could detect that their whisper occurred
• 15:14
  Speaker 2: one trillionth of a second before the crowd roared.
• 15:17
  Speaker 3: Wow. Yeah, that is a highly accurate way to view it,
• 15:19
  Speaker 3: because the tracking algorithms can use that fourth dimension to
• 15:23
  Speaker 3: separate collision vertices.
• 15:24
  Speaker 2: So it untangles them.
• 15:26
  Speaker 3: Right. If two particles hit the detector overlapping in physical space,
• 15:30
  Speaker 3: the system might mistakenly think they came from the same interaction.
• 15:34
  Speaker 2: But with the timing exactly.
• 15:35
  Speaker 3: If the timing detector shows that particle A arrived thirty
• 15:38
  Speaker 3: pico seconds before particle B, the algorithms can mathematically separate them.
• 15:42
  Speaker 2: That's incredible.
• 15:43
  Speaker 3: It acts as an incredibly precise filter. It strips away
• 15:48
  Speaker 3: the enormous background of overlapping interactions and allows physicists to
• 15:52
  Speaker 3: reconstruct those extremely rare die Higgs events that would otherwise
• 15:57
  Speaker 3: be entirely lost in the noise.
• 15:58
  Speaker 2: It is staggering. We're talking about measuring microscopic events happening
• 16:03
  Speaker 2: in trillions of a second. But when you zoom out
• 16:06
  Speaker 2: from that microscopic scale, you hit this entirely different reality,
• 16:09
  Speaker 2: which is the massive, decades long human effort making this
• 16:13
  Speaker 2: four D tracking possible.
• 16:15
  Speaker 3: The contrast in scales is almost poetic, isn't it. Absolutely
• 16:18
  Speaker 3: you have the fastest, smallest, most fleeting interactions in nature
• 16:21
  Speaker 3: being captured by macroscopic machines that basically take human lifetimes
• 16:26
  Speaker 3: to conceptualize, fund construct, and operate.
• 16:28
  Speaker 2: I mean, right now, across the globe, there is this
• 16:30
  Speaker 2: painstaking engineering process unfolding in places like Oxford or the
• 16:35
  Speaker 2: clean rooms at CERN. Teams are physically assembling the first
• 16:38
  Speaker 2: complete pixel rings for these upgraded inner trackers.
• 16:41
  Speaker 3: Right it's happening as we speak.
• 16:42
  Speaker 2: You have these delicate, strikingly complex arrangements of three D
• 16:47
  Speaker 2: silicon sensors, ultra fast electronics, and incredibly lightweight carbon fiber
• 16:52
  Speaker 2: support structures being meticulously wire bonded and pieced together.
• 16:56
  Speaker 3: And what is truly remarkable about this phase of the
• 16:59
  Speaker 3: project is the generational shift it represents. Howso well a
• 17:04
  Speaker 3: project of this scale isn't just an evolution of technology.
• 17:07
  Speaker 3: It is literally the transfer of human knowledge. The brilliant
• 17:12
  Speaker 3: young graduate students who are currently in those clean rooms
• 17:15
  Speaker 3: carefully soldering and testing these delicate silicon detectors. Yeah, they're
• 17:19
  Speaker 3: going to spend the rest of their entire professional careers
• 17:22
  Speaker 3: analyzing the data that this specific machine starts producing. In
• 17:26
  Speaker 3: the twenty thirties and forties.
• 17:27
  Speaker 2: They are quite literally building the instruments that will define
• 17:30
  Speaker 2: their life's work exactly.
• 17:32
  Speaker 3: This shutdown isn't just a routine maintenance period. It is
• 17:35
  Speaker 3: the dawn of the precision era in experimental physics. The
• 17:38
  Speaker 3: high luminosity upgrade is going to dictate the trajectory of
• 17:41
  Speaker 3: our understanding of the universe for the next four decades.
• 17:44
  Speaker 2: So to bring this all together for you, we started
• 17:46
  Speaker 2: deep underground, looking at one point two kilometers of dismantled machinery.
• 17:52
  Speaker 2: A silent behemoth resting in the dark, but it is
• 17:55
  Speaker 2: undergoing a radical transformation by utilizing nobium ten magnets to
• 18:00
  Speaker 2: squeeze proton beams into ultra dense ribbons, deploying radiation hardened
• 18:04
  Speaker 2: three D silicon, and adding forty timing detectors capable of
• 18:08
  Speaker 2: measuring trillions of a second. Scientists are basically setting the
• 18:11
  Speaker 2: ultimate trap.
• 18:12
  Speaker 3: The ultimate trap for the universe.
• 18:14
  Speaker 2: Exactly, they are boosting the collision volume by a factor
• 18:16
  Speaker 2: of seven, hoping to catch the Higgs boson acting Strangely,
• 18:20
  Speaker 2: they are hunting for the tiny deviations in Muon decays
• 18:23
  Speaker 2: or Higgs self coupling that might finally explain the mysteries
• 18:26
  Speaker 2: of dark matter and map the boiling phase transitions of
• 18:29
  Speaker 2: the early universe.
• 18:30
  Speaker 3: Which brings us to perhaps the most provocative question in
• 18:33
  Speaker 3: all of modern physics right now.
• 18:34
  Speaker 4: Oh, what's that?
• 18:36
  Speaker 3: It's a scenario that genuinely keeps theorists awake at night.
• 18:39
  Speaker 2: Okay, I'm listening.
• 18:40
  Speaker 3: The entire justification for this multi billion dollar, decades long
• 18:44
  Speaker 3: global upgrade is the hope of finding tiny cracks in
• 18:48
  Speaker 3: the standard model. We are desperate for a.
• 18:50
  Speaker 2: Deviation, right, We want to find something new.
• 18:53
  Speaker 3: We need the Higgs to behave a little strangely, so
• 18:55
  Speaker 3: we can map out new physics to explain dark matter
• 18:58
  Speaker 3: and the universe's anti matter asymmetry.
• 19:01
  Speaker 2: We are banking on finding an anomaly.
• 19:04
  Speaker 3: But consider the alternative. What if the hl LHC switches
• 19:08
  Speaker 3: on in twenty thirty tracks billions of high luminosity collisions
• 19:12
  Speaker 3: in perfect four dimensional space and time analyzes every single
• 19:16
  Speaker 3: rare die Higgs decay with unprecedented precision and finds that
• 19:20
  Speaker 3: the Higgs behaves flawlessly.
• 19:22
  Speaker 2: Wait, like, what if it's exactly what we already predicted?
• 19:25
  Speaker 3: Exactly? What if the mathematical framework of the Standard Model
• 19:28
  Speaker 3: is absolutely perfect at this energy scale, If there are
• 19:32
  Speaker 3: no cracks, no deviations, no tilted Mexican hats.
• 19:35
  Speaker 4: That would mean Wait what would that mean?
• 19:37
  Speaker 3: Does that actually leave us completely in the dark about
• 19:39
  Speaker 3: the rest of the universe's most profound mysteries. If this
• 19:42
  Speaker 3: incredible machine works perfectly and the theory holds perfectly, we
• 19:46
  Speaker 3: might suddenly find ourselves confronting the terrifying reality that we
• 19:49
  Speaker 3: simply have no idea or to look next.
• 19:51
  Speaker 4: Now, that is the thought to leave you with