Collider Detector at Fermilab

Last updated
Wilson Hall at Fermilab Wilson hall fall b.jpg
Wilson Hall at Fermilab
Part of the CDF detector Collider Detector at Fermilab.jpg
Part of the CDF detector

The Collider Detector at Fermilab (CDF) experimental collaboration studies high energy particle collisions from the Tevatron, the world's former highest-energy particle accelerator. The goal is to discover the identity and properties of the particles that make up the universe and to understand the forces and interactions between those particles.

Contents

CDF is an international collaboration that, at its peak, consisted of about 600 physicists [1] (from about 30 American universities and National laboratories and about 30 groups from universities and national laboratories from Italy, Japan, UK, Canada, Germany, Spain, Russia, Finland, France, Taiwan, Korea, and Switzerland). [2] The CDF detector itself weighed about 5000 tons [3] and was about 12 meters in all three dimensions. The goal of the experiment is to measure exceptional events out of the billions of particle collisions in order to:

The Tevatron collided protons and antiprotons at a center-of-mass energy of about 2 TeV. The very high energy available for these collisions made it possible to produce heavy particles such as the top quark and the W and Z bosons, which weigh much more than a proton (or antiproton). These heavier particles were identified through their characteristic decays. [4] The CDF apparatus recorded the trajectories and energies of electrons, photons and light hadrons. Neutrinos did not register in the apparatus, which led to an apparent missing energy. [5]

There is another experiment similar to CDF called DØ which had a detector located at another point on the Tevatron ring.

History

There were two particle detectors located on the Tevatron at Fermilab: CDF and DØ. CDF predated DØ as the first detector on the Tevatron. CDF's origins trace back to 1976, when Fermilab established the Colliding Beams Department under the leadership of Jim Cronin. This department focused on the development of both the accelerator that would produce colliding particle beams and the detector that would analyze those collisions. When the lab dissolved this department at the end of 1977, it established the Colliding Detector Facility Department under the leadership of Alvin Tollestrup. In 1980, Roy Schwitters became associate head of CDF and KEK in Japan and the National Laboratory of Frascati in Italy joined the collaboration. The collaboration completed a conceptual design report for CDF in the summer of 1981, and construction on the collision hall began on July 1, 1982. The lab dedicated the CDF detector on October 11, 1985, and CDF observed the Tevatron's first proton-antiproton collisions on October 13, 1985. [6]

Over the years, two major updates were made to CDF. The first upgrade began in 1989 and the second began in 2001. Each upgrade was considered a "run". Run 0 was the run before any upgrades (1988–1989), Run I was after the first upgrade, and Run II was after the second upgrade. The upgrades for Run I included the addition of a silicon vertex detector (the first such detector to be installed in a hadron collider experiment), [7] improvements to the central muon system, the addition of a vertex tracking system, the addition of central preradiator chambers, and improvements to the readout electronics and computer systems. [8] Run II included upgrades on the central tracking system, preshower detectors and extension on muon coverage. [9]

CDF took data until the Tevatron was shut down in 2011, but CDF scientists continue to analyze data collected by the experiment. [10]

Discovery of the top quark

CDF Collaboration group photo, April 14, 1994. CDF Collaborators Group Photo 94-0374-04.jpg
CDF Collaboration group photo, April 14, 1994。

One of CDF's most famous discoveries is the observation of the top quark in February 1995. [11] The existence of the top quark was hypothesized after the observation of the Upsilon at Fermilab in 1977, which was found to consist of a bottom quark and an anti-bottom quark. The Standard Model, the most widely accepted theory describing particles and their interactions, predicted the existence of three generations of quarks. [12] The first generation quarks are the up and down quarks, second generation quarks are strange and charm, and third generation are top and bottom. The existence of the bottom quark solidified physicists' conviction that the top quark existed. [13] The top quark was the last of the quarks to be observed, mostly due to its comparatively high mass. Whereas the masses of the other quarks range from .005 GeV (up quark) to 4.7GeV (bottom quark), the top quark has a mass of 175 GeV. [14] Only Fermilab's Tevatron had the energy capability to produce and detect top anti-top pairs. The large mass of the top quark caused the top quark to decay almost instantaneously, within the order of 10−25 seconds, making it extremely difficult to observe. The Standard Model predicts that the top quark may decay leptonically into a bottom quark and a W boson. This W boson may then decay into a lepton and neutrino (t→Wb→ѵlb). Therefore, CDF worked to reconstruct top events, looking specifically for evidence of bottom quarks, W bosons neutrinos. Finally in February 1995, CDF had enough evidence to say that they had "discovered" the top quark. [15] On February 24, CDF and DØ experimenters simultaneously submitted papers to Physical Review Letters describing the observation of the top quark. The two collaborations announced the discovery publicly at a seminar at Fermilab on March 2 and the papers were published on April 3. [16]

In 2019, the European Physical Society awarded the 2019 European Physical Society High Energy and Particle Physics Prize to the CDF and DØ collaborations "for the discovery of the top quark and the detailed measurement of its properties." [17]

Other discoveries and milestones

On September 25, 2006, the CDF collaboration announced that they had discovered that the B-sub-s meson rapidly oscillates between matter and antimatter at a rate of 3 trillion times per second, a phenomenon called B–Bbar oscillation. [18]

On January 8, 2007, the CDF collaboration announced that they had achieved the world's most precise measurement by a single experiment of the mass of the W boson. This provided new constraints on the possible mass of the then-undiscovered Higgs boson. [19] [20]

On April 7, 2022, the CDF collaboration announced in a paper published in the journal Science that they had made the most precise measurement ever of the mass of the W boson and found its actual mass to be significantly higher than the mass predicted by the Standard Model and the masses that had been measured before. [21] In 2023, the ATLAS experiment at the Large Hadron Collider released an improved measurement for the mass of the W boson, 80,360 ± 16 MeV, which aligned with predictions from the Standard Model. [22] [23]

CDF scientists also discovered several other particles, including the B-sub-c meson [24] (announced March 5, 1998); sigma-sub-b baryons, baryons consisting of two up quarks and a bottom quark and of two down quarks and a bottom quark (announced October 23, 2006); [25] cascade-b baryons, consisting of a down, a strange, and a bottom quark (discovered jointly with DØ and announced on June 15, 2007); [26] and omega-sub-b baryons, consisting of two strange quarks and a bottom quark (announced in June 2009). [27]

Detector layers

In order for physicists to understand the data corresponding to each event, they must understand the components of the CDF detector and how the detector works. Each component affects what the data will look like. Today, the 5000-ton detector sits in B0 and analyzes millions of beam collisions per second. [28] The detector is designed in many different layers. Each of these layers work simultaneously with the other components of the detector in an effort to interact with the different particles, thereby giving physicists the opportunity to "see" and study the individual particles.

CDF can be divided into layers as follows:

Layer 1: the beam pipe

The beam pipe is the innermost layer of CDF. The beam pipe is where the protons and anti-protons, traveling at approximately 0.99996 c, collide head on. Each of the protons is moving extremely close to the speed of light with extremely high energies. In a collision, much of the energy is converted into mass. This allows proton/anti-proton annihilation to produce daughter particles, such as top quarks with a mass of 175 GeV, much heavier than the original protons. [29]

Layer 2: silicon detector

CDF silicon vertex detector Collider Detector at Fermilab (CDF) silicon vertex detector.JPG
CDF silicon vertex detector
Cross section of the silicon detector Collider Detector at Fermilab (CDF) silicon vertex detector cross section.JPG
Cross section of the silicon detector

Surrounding the beam pipe is the silicon detector. This detector is used to track the path of charged particles as they travel through the detector. The silicon detector begins at a radius of r = 1.5 cm from the beam line and extends to a radius of r = 28 cm from the beam line. [9] The silicon detector is composed of seven layers of silicon arranged in a barrel shape around the beam pipe. Silicon is often used in charged particle detectors because of its high sensitivity, allowing for high-resolution vertex and tracking. [30] The first layer of silicon, known as Layer 00, is a single sided detector designed to separate signal from background even under extreme radiation. The remaining layers are double sided and radiation-hard, meaning that the layers are protected from damage from radioactivity. [9] The silicon works to track the paths of charged particles as they pass through the detector by ionizing the silicon. The density of the silicon, coupled with the low ionization energy of silicon, allow ionization signals to travel quickly. [30] As a particle travels through the silicon, its position will be recorded in 3 dimensions. The silicon detector has a track hit resolution of 10 μm, and impact parameter resolution of 30 μm. [9] Physicists can look at this trail of ions and determine the path that the particle took. [29] As the silicon detector is located within a magnetic field, the curvature of the path through the silicon allows physicists to calculate the momentum of the particle. More curvature means less momentum and vice versa.

Layer 3: central outer tracker (COT)

Outside of the silicon detector, the central outer tracker works in much the manner as the silicon detector as it is also used to track the paths of charged particles and is also located within a magnetic field. The COT, however, is not made of silicon. Silicon is tremendously expensive and is not practical to purchase in extreme quantities. COT is a gas chamber filled with tens of thousands of gold wires arranged in layers and argon gas. Two types of wires are used in the COT: sense wires and field wires. Sense wires are thinner and attract the electrons that are released by the argon gas as it is ionized. The field wires are thicker than the sense wires and attract the positive ions formed from the release of electrons. [29] There are 96 layers of wire and each wire is placed approximately 3.86 mm apart from one another. [9] As in the silicon detector, when a charged particle passes through the chamber it ionizes the gas. This signal is then carried to a nearby wire, which is then carried to the computers for read-out. The COT is approximately 3.1 m long and extends from r = 40 cm to r = 137 cm. Although the COT is not nearly as precise as the silicon detector, the COT has a hit position resolution of 140 μm and a momentum resolution of 0.0015 (GeV/c)−1. [9]

Layer 4: solenoid magnet

The solenoid magnet surrounds both the COT and the silicon detector. The purpose of the solenoid is to bend the trajectory of charged particles in the COT and silicon detector by creating a magnetic field parallel to the beam. [9] The solenoid has a radius of r = 1.5 m and is 4.8 m in length. The curvature of the trajectory of the particles in the magnet field allows physicists to calculate the momentum of each of the particles. The higher the curvature, the lower the momentum and vice versa. Because the particles have such a high energy, a very strong magnet is needed to bend the paths of the particles. The solenoid is a superconducting magnet cooled by liquid helium. The helium lowers the temperature of the magnet to 4.7 K or −268.45 °C which reduces the resistance to almost zero, allowing the magnet to conduct high currents with minimal heating and very high efficiency, and creating a powerful magnetic field. [29]

Layers 5 and 6: electromagnetic and hadronic calorimeters

Calorimeters quantify the total energy of the particles by converting the energy of particles to visible light though polystyrene scintillators. CDF uses two types of calorimeters: electromagnetic calorimeters and hadronic calorimeters. The electromagnetic calorimeter measures the energy of light particles and the hadronic calorimeter measures the energy of hadrons. [29] The central electromagnetic calorimeter uses alternating sheets of lead and scintillator. Each layer of lead is approximately 20 mm (3⁄4 in) wide. The lead is used to stop the particles as they pass through the calorimeter and the scintillator is used to quantify the energy of the particles. The hadronic calorimeter works in much the same way except the hadronic calorimeter uses steel in place of lead. [9] Each calorimeter forms a wedge, which consists of both an electromagnetic calorimeter and a hadronic calorimeter. These wedges are about 2.4 m (8 ft) in length and are arranged around the solenoid. [29]

Layer 7: muon detectors

The final "layer" of the detector consists of the muon detectors. Muons are charged particles that may be produced when heavy particles decay. These high-energy particles hardly interact so the muon detectors are strategically placed at the farthest layer from the beam pipe behind large walls of steel. The steel ensures that only extremely high-energy particles, such as neutrinos and muons, pass through to the muon chambers. [29] There are two aspects of the muon detectors: the planar drift chambers and scintillators. There are four layers of planar drift chambers, each with the capability of detecting muons with a transverse momentum pT> 1.4 GeV/c. [9] These drift chambers work in the same way as the COT. They are filled with gas and wire. The charged muons ionize the gas and the signal is carried to readout by the wires. [29]

Conclusion

Understanding the different components of the detector is important because the detector determines what data will look like and what signal one can expect to see for each particle. A detector is basically a set of obstacles used to force particles to interact, allowing physicists to "see" the presence of a certain particle. If a charged quark is passing through the detector, the evidence of this quark will be a curved trajectory in the silicon detector and COT deposited energy in the calorimeter. If a neutral particle, such as a neutron, passes through the detector, there will be no track in the COT and silicon detector but deposited energy in the hadronic calorimeter. Muons may appear in the COT and silicon detector and as deposited energy in the muon detectors. Likewise, a neutrino, which rarely if ever interacts, will express itself only in the form of missing energy.

Related Research Articles

<span class="mw-page-title-main">Particle physics</span> Study of subatomic particles and forces

Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation. The field also studies combinations of elementary particles up to the scale of protons and neutrons, while the study of combination of protons and neutrons is called nuclear physics.

<span class="mw-page-title-main">Fermilab</span> High-energy particle physics laboratory in Illinois, USA

Fermi National Accelerator Laboratory (Fermilab), located just outside Batavia, Illinois, near Chicago, is a United States Department of Energy national laboratory specializing in high-energy particle physics. Since 2007, Fermilab has been operated by the Fermi Research Alliance (FRA), a joint venture of the University of Chicago, and the Universities Research Association (URA); although in 2023, the Department of Energy (DOE) opened bidding for a new contractor due to concerns about the FRA performance. Fermilab is a part of the Illinois Technology and Research Corridor.

<span class="mw-page-title-main">Tevatron</span> Defunct American particle accelerator at Fermilab in Illinois (1983–2011)

The Tevatron was a circular particle accelerator in the United States, at the Fermi National Accelerator Laboratory, east of Batavia, Illinois, and was the highest energy particle collider until the Large Hadron Collider (LHC) of the European Organization for Nuclear Research (CERN) was built near Geneva, Switzerland. The Tevatron was a synchrotron that accelerated protons and antiprotons in a 6.28 km (3.90 mi) circumference ring to energies of up to 1 TeV, hence its name. The Tevatron was completed in 1983 at a cost of $120 million and significant upgrade investments were made during its active years of 1983–2011.

<span class="mw-page-title-main">Top quark</span> Type of quark

The top quark, sometimes also referred to as the truth quark, is the most massive of all observed elementary particles. It derives its mass from its coupling to the Higgs Boson. This coupling is very close to unity; in the Standard Model of particle physics, it is the largest (strongest) coupling at the scale of the weak interactions and above. The top quark was discovered in 1995 by the CDF and DØ experiments at Fermilab.

<span class="mw-page-title-main">Compact Muon Solenoid</span> General-purposes experiment at the Large Hadron Collider

The Compact Muon Solenoid (CMS) experiment is one of two large general-purpose particle physics detectors built on the Large Hadron Collider (LHC) at CERN in Switzerland and France. The goal of the CMS experiment is to investigate a wide range of physics, including the search for the Higgs boson, extra dimensions, and particles that could make up dark matter.

<span class="mw-page-title-main">Large Hadron Collider</span> Particle accelerator at CERN, Switzerland

The Large Hadron Collider (LHC) is the world's largest and highest-energy particle collider. It was built by the European Organization for Nuclear Research (CERN) between 1998 and 2008 in collaboration with over 10,000 scientists and hundreds of universities and laboratories across more than 100 countries. It lies in a tunnel 27 kilometres (17 mi) in circumference and as deep as 175 metres (574 ft) beneath the France–Switzerland border near Geneva.

In particle physics, the W and Z bosons are vector bosons that are together known as the weak bosons or more generally as the intermediate vector bosons. These elementary particles mediate the weak interaction; the respective symbols are
W+
,
W−
, and
Z0
. The
W±
 bosons have either a positive or negative electric charge of 1 elementary charge and are each other's antiparticles. The
Z0
 boson is electrically neutral and is its own antiparticle. The three particles each have a spin of 1. The
W±
 bosons have a magnetic moment, but the
Z0
 has none. All three of these particles are very short-lived, with a half-life of about 3×10−25 s. Their experimental discovery was pivotal in establishing what is now called the Standard Model of particle physics.

<span class="mw-page-title-main">ATLAS experiment</span> CERN LHC experiment

ATLAS is the largest general-purpose particle detector experiment at the Large Hadron Collider (LHC), a particle accelerator at CERN in Switzerland. The experiment is designed to take advantage of the unprecedented energy available at the LHC and observe phenomena that involve highly massive particles which were not observable using earlier lower-energy accelerators. ATLAS was one of the two LHC experiments involved in the discovery of the Higgs boson in July 2012. It was also designed to search for evidence of theories of particle physics beyond the Standard Model.

<span class="mw-page-title-main">Compact Linear Collider</span> Concept for a linear particle accelerator

The Compact Linear Collider (CLIC) is a concept for a future linear particle accelerator that aims to explore the next energy frontier. CLIC would collide electrons with positrons and is currently the only mature option for a multi-TeV linear collider. The accelerator would be between 11 and 50 km long, more than ten times longer than the existing Stanford Linear Accelerator (SLAC) in California, US. CLIC is proposed to be built at CERN, across the border between France and Switzerland near Geneva, with first beams starting by the time the Large Hadron Collider (LHC) has finished operations around 2035.

<span class="mw-page-title-main">UA2 experiment</span> Particle physics experiment at CERN

The Underground Area 2 (UA2) experiment was a high-energy physics experiment at the Proton-Antiproton Collider — a modification of the Super Proton Synchrotron (SPS) — at CERN. The experiment ran from 1981 until 1990, and its main objective was to discover the W and Z bosons. UA2, together with the UA1 experiment, succeeded in discovering these particles in 1983, leading to the 1984 Nobel Prize in Physics being awarded to Carlo Rubbia and Simon van der Meer. The UA2 experiment also observed the first evidence for jet production in hadron collisions in 1981, and was involved in the searches of the top quark and of supersymmetric particles. Pierre Darriulat was the spokesperson of UA2 from 1981 to 1986, followed by Luigi Di Lella from 1986 to 1990.

<span class="mw-page-title-main">ALICE experiment</span> Detector experiments at the Large Hadron Collider

ALICE is one of nine detector experiments at the Large Hadron Collider at CERN. The other eight are: ATLAS, CMS, TOTEM, LHCb, LHCf, MoEDAL, FASER and SND@LHC.

<span class="mw-page-title-main">DØ experiment</span> Particle physics research project (1983–2011)

The DØ experiment was a worldwide collaboration of scientists conducting research on the fundamental nature of matter. DØ was one of two major experiments located at the Tevatron Collider at Fermilab in Batavia, Illinois. The Tevatron was the world's highest-energy accelerator from 1983 until 2009, when its energy was surpassed by the Large Hadron Collider. The DØ experiment stopped taking data in 2011, when the Tevatron shut down, but data analysis is still ongoing. The DØ detector is preserved in Fermilab's DØ Assembly Building as part of a historical exhibit for public tours.

Leptoquarks are hypothetical particles that would interact with quarks and leptons. Leptoquarks are color-triplet bosons that carry both lepton and baryon numbers. Their other quantum numbers, like spin, (fractional) electric charge and weak isospin vary among models. Leptoquarks are encountered in various extensions of the Standard Model, such as technicolor theories, theories of quark–lepton unification (e.g., Pati–Salam model), or GUTs based on SU(5), SO(10), E6, etc. Leptoquarks are currently searched for in experiments ATLAS and CMS at the Large Hadron Collider in CERN.

<span class="mw-page-title-main">ZEUS (particle detector)</span>

ZEUS was a particle detector at the HERA particle accelerator at the German national laboratory DESY in Hamburg. It began taking data in 1992 and was operated until HERA was decommissioned in June 2007. The scientific collaboration behind ZEUS consisted of about 400 physicists and technicians from 56 institutes in 17 countries.

In particle physics, a hermetic detector is a particle detector designed to observe all possible decay products of an interaction between subatomic particles in a collider by covering as large an area around the interaction point as possible and incorporating multiple types of sub-detectors. They are typically roughly cylindrical, with different types of detectors wrapped around each other in concentric layers; each detector type specializes in particular particles so that almost any particle will be detected and identified. Such detectors are called "hermetic" because they are constructed so as the motion of particles are ceased at the boundaries of the chamber without any moving beyond due to the seals; the name "4π detector" comes from the fact that such detectors are designed to cover nearly all of the 4π steradians of solid angle around the interaction point; in terms of the standard coordinate system used in collider physics, this is equivalent to coverage of the entire range of azimuthal angle and pseudorapidity. In practice, particles with pseudorapidity above a certain threshold cannot be measured since they are too nearly parallel to the beamline and can thus pass through the detector. This limit on the pseudorapidity ranges which can be observed forms part of the acceptance of the detector ; broadly speaking, the main design objective of a hermetic detector is to maximise acceptance, i.e. to ensure that the detector is able to measure as large a phase space region as possible.

<span class="mw-page-title-main">Young-Kee Kim</span>

Young-Kee Kim is a South Korea-born American physicist and Louis Block Distinguished Service Professor of Physics at the University of Chicago. She is chair of the Department of Physics at the university.

Paul Dutton Grannis is an American physicist.

Paraskevas Andreas Sphicas is a particle physicist who focuses on studies of High energy collisions in the Large Hadron Collider through which he explores supersymmetry and the mechanism of spontaneous symmetry breaking. He is a senior scientist at CERN and professor of physics at the National and Kapodistrian University of Athens. He was elected a Fellow of the Royal Society (FRS) in 2019.

<span class="mw-page-title-main">Brad Cox (physicist)</span> American physicist

Bradley Cox is an American physicist, academic and researcher. He is a Professor of Physics and the founder of the High Energy Physics Group at the University of Virginia.

Steven Michael Errede is an American experimental physicist, known for his leadership in the collaboration that experimentally confirmed the existence of the top quark.

References

  1. ↑ Toback, David (2017-06-30). "CDF publishes 700 papers". Fermilab - News at Work. Archived from the original on 2018-10-22. Retrieved 2021-01-05.
  2. 1 2 Yoh, John (2005-04-20). "Brief Introduction to the CDF Experiment". The Collider Detector at Fermilab. Archived from the original on 2004-12-04. Retrieved 2020-01-05.
  3. ↑ Browne, Malcolm W. (1995-03-01). "Top Quark Remains a Mystery, but Only for One More Day (Published 1995)". The New York Times. ISSN   0362-4331 . Retrieved 2021-01-05.
  4. ↑ Denisov, Dmitri; Konigsberg, Jacobo (2016-04-15). "The Tevatron legacy: a luminosity story". CERN Courier. Archived from the original on 2020-06-23. Retrieved 2021-03-12.
  5. ↑ Yoh, John (January 7, 2005). "Introduction to the CDF Detector and the Particles We Observe". The Collider Detector at Fermilab. Archived from the original on 2004-12-04. Retrieved March 12, 2021.
  6. ↑ Hoddeson, Lillian; Kolb, Adrienne; Westfall, Catherine (2008). Fermilab : physics, the frontier, and megascience. Chicago: University of Chicago Press. ISBN   978-0-226-34623-6. OCLC   192045754.
  7. ↑ Hartmann, Frank (2017). "CDF: The World's Largest Silicon Detector in the 20th Century; the First Silicon Detector at a Hadron Collider". Evolution of Silicon Sensor Technology in Particle Physics. Springer Tracts in Modern Physics. Vol. 275. Springer, Cham. pp. 195–218. doi:10.1007/978-3-319-64436-3_5. ISBN   978-3-319-64436-3.
  8. ↑ "CDF upgraded for collider run" (PDF). Ferminews. 15 (12): 3, 9. 1992-07-03.
  9. 1 2 3 4 5 6 7 8 9 "Brief Description of the CDF Detector in Run II." (2004): 1-2.
  10. ↑ "Tevatron shuts down, but analysis continues". Fermilab - News. 2011-09-30. Retrieved 2022-03-22.
  11. ↑ Kilminster, Ben. "CDF "Results of the Week" in Fermilab Today." The Collider Detector at Fermilab. Collider Detector at Fermilab. 28 Apr. 2009 <http://www-cdf.fnal.gov/rotw/CDF_ROW_descriptions.html>.
  12. ↑ "The Standard Model". CERN. CERN. Retrieved 2019-05-28.
  13. ↑ Lankford, Andy. "Discovery of the Top Quark." Collider Detector at Fermilab. 25 Apr. 2009 <http://www.ps.uci.edu/physics/news/lankford.html>.
  14. ↑ "Quark Chart." The Particle Adventure. Particle Data Group. 5 May 2009 <http://www3.fi.mdp.edu.ar/fc3/particle/quark_chart.html%5B%5D>.
  15. ↑ Quigg, Chris. "Discovery of the Top Quark." 1996. Fermi National Accelerator Laboratory. 8 May 2009 <http://lutece.fnal.gov/Papers/PhysNews95.html>.
  16. ↑ Denisov, Dmitri; Vellidis, Costas (2015-04-01). "The top quark, 20 years after its discovery". Physics Today. 68 (4): 46–52. doi: 10.1063/PT.3.2749 . ISSN   0031-9228.
  17. ↑ Hesla, Leah (2019-05-21). "European Physical Society gives top prize to Fermilab's CDF, DZero experiments for top quark discovery, measurements". Fermilab - News. Retrieved 2022-03-29.
  18. ↑ "Fermilab's CDF scientists make it official: They have discovered the quick-change behavior of the B-sub-s meson, which switches between matter and antimatter 3 trillion times a second". Fermilab - News. 2006-09-25. Retrieved 2022-03-22.
  19. ↑ "CDF precision measurement of W-boson mass suggests a lighter Higgs particle". Fermilab - News. 2007-01-08. Retrieved 2022-03-22.
  20. ↑ "Precision measurement of W-boson mass suggests a lighter Higgs particle". phys.org. Retrieved 2022-03-22.
  21. ↑ CDF Collaboration†‡; Aaltonen, T.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Appel, J. A.; Arisawa, T.; Artikov, A. (2022-04-08). "High-precision measurement of the W boson mass with the CDF II detector". Science. 376 (6589): 170–176. doi:10.1126/science.abk1781. hdl: 11390/1225696 . ISSN   0036-8075. PMID   35389814. S2CID   248025265.
  22. ↑ Ouellette, Jennifer (24 March 2023). "New value for W boson mass dims 2022 hints of physics beyond Standard Model". Ars Technica. Retrieved 26 March 2023.
  23. ↑ "Improved W boson Mass Measurement using $\sqrt{s}=7$ TeV Proton-Proton Collisions with the ATLAS Detector". ATLAS experiment. CERN. 22 March 2023. Retrieved 26 March 2023.
  24. ↑ Jackson, Judy (1998-03-20). "CDF Corrals the Last of the Mesons" (PDF). FermiNews. pp. 1–2. Retrieved 2022-03-29.
  25. ↑ "Experimenters at Fermilab discover exotic relatives of protons and neutrons". Fermilab - News. 2006-10-23. Retrieved 2022-03-22.
  26. ↑ "Back-to-Back b Baryons in Batavia". Fermilab - News. 2007-06-25. Retrieved 2022-03-22.
  27. ↑ "Fermilab's CDF observes Omega-sub-b baryon". Fermilab - News. 2009-06-29. Retrieved 2022-03-22.
  28. ↑ Yoh, John (2005). Brief Introduction to the CDF Experiment. Retrieved April 28, 2008, Web site: http://www-cdf.fnal.gov/events/cdfintro.html <http://www-cdf.fnal.gov/upgrades/tdr/tdr.html>
  29. 1 2 3 4 5 6 7 8 Lee, Jenny (2008). The Collider Detector at Fermilab. Retrieved September 26, 2008, from CDF Virtual Tour Web site: http://www-cdf.fnal.gov/
  30. 1 2 "Particle Detectors." Particle Data Group. 24 July 2008. Fermi National Accelerator Laboratory. 11 May 2009 <http://pdg.lbl.gov/2008/reviews/rpp2008-rev-particle-detectors.pdf>.

Further reading

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.