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Gluon
A gluon /ˈɡluːɒn/ is an elementary particle that acts as the exchange particle (or gauge boson) for the strong force between quarks. It is analogous to

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This article may be too technical for most readers to understand. Please help improve it to make it understandable to non-experts, without removing the technical details. The talk page may contain suggestions. (December 2015) (Learn how and when to remove this template message) Gluon Diagram 1: In Feynman diagrams, emitted gluons are represented as helices. This diagram depicts the annihilation of an electron and positron. Composition Elementary particle Statistics Bosonic Interactions Strong interaction Symbol g Theorized Murray Gell-Mann (1962) Discovered

e+e− → Υ(9.46) → 3g: 1978 at DORIS (DESY) by PLUTO experiments (see diagram 2 and recollection)
and

e+e− → qqg: 1979 at PETRA (DESY) by TASSO, MARK-J, JADE and PLUTO experiments (see diagram 1 and review) Types 8 Mass 0 (theoretical value)
< 7000130000000000000♠1.3 MeV/c2 (experimental limit) Electric charge 0 e Color charge octet (8 linearly independent types) Spin 1 Standard Model of particle physics Fundamental particles of the standard model Background Particle physics
Standard Model
Quantum field theory
Gauge theory
Spontaneous symmetry breaking
Higgs mechanism Constituents Electroweak interaction
Quantum chromodynamics
CKM matrix
Standard Model mathematics Limitations Strong CP problem
Hierarchy problem
Neutrino oscillations
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A gluon /ˈɡluːɒn/ is an elementary particle that acts as the exchange particle (or gauge boson) for the strong force between quarks. It is analogous to the exchange of photons in the electromagnetic force between two charged particles. In layman's terms, they "glue" quarks together, forming protons and neutrons.

In technical terms, gluons are vector gauge bosons that mediate strong interactions of quarks in quantum chromodynamics (QCD). Gluons themselves carry the color charge of the strong interaction. This is unlike the photon, which mediates the electromagnetic interaction but lacks an electric charge. Gluons therefore participate in the strong interaction in addition to mediating it, making QCD significantly harder to analyze than QED (quantum electrodynamics).

Contents
  • 1 Properties
  • 2 Counting gluons
    • 2.1 Color charge and superposition
    • 2.2 Color singlet states
    • 2.3 Eight gluon colors
    • 2.4 Group theory details
  • 3 Confinement
  • 4 Experimental observations
  • 5 See also
  • 6 References
  • 7 Further reading

Properties

The gluon is a vector boson; like the photon, it has a spin of 1. While massive spin-1 particles have three polarization states, massless gauge bosons like the gluon have only two polarization states because gauge invariance requires the polarization to be transverse. In quantum field theory, unbroken gauge invariance requires that gauge bosons have zero mass (experiment limits the gluon's rest mass to less than a few meV/c2). The gluon has negative intrinsic parity.

Counting gluons

Unlike the single photon of QED or the three W and Z bosons of the weak interaction, there are eight independent types of gluon in QCD.

This may be difficult to understand intuitively. Quarks carry three types of color charge; antiquarks carry three types of anticolor. Gluons may be thought of as carrying both color and anticolor. This gives nine possible combinations of color and anticolor in gluons. The following is a list of those combinations (and their schematic names):

  • red-antired ( r r ¯ {\displaystyle r{\bar {r}}} ), red-antigreen ( r g ¯ {\displaystyle r{\bar {g}}} ), red-antiblue ( r b ¯ {\displaystyle r{\bar {b}}} )
  • green-antired ( g r ¯ {\displaystyle g{\bar {r}}} ), green-antigreen ( g g ¯ {\displaystyle g{\bar {g}}} ), green-antiblue ( g b ¯ {\displaystyle g{\bar {b}}} )
  • blue-antired, ( b r ¯ {\displaystyle b{\bar {r}}} ), blue-antigreen ( b g ¯ {\displaystyle b{\bar {g}}} ), blue-antiblue ( b b ¯ {\displaystyle b{\bar {b}}} )
Diagram 2: e+e− → Υ(9.46) → 3g

These are not the actual color states of observed gluons, but rather effective states. To correctly understand how they are combined, it is necessary to consider the mathematics of color charge in more detail.

Color charge and superposition

In quantum mechanics, the states of particles may be added according to the principle of superposition; that is, they may be in a "combined state" with a probability, if some particular quantity is measured, of giving several different outcomes. A relevant illustration in the case at hand would be a gluon with a color state described by:

( r b ¯ + b r ¯ ) / 2 . {\displaystyle (r{\bar {b}}+b{\bar {r}})/{\sqrt {2}}.}

This is read as "red–antiblue plus blue–antired". (The factor of the square root of two is required for normalization, a detail that is not crucial to understand in this discussion.) If one were somehow able to make a direct measurement of the color of a gluon in this state, there would be a 50% chance of it having red-antiblue color charge and a 50% chance of blue-antired color charge.

Color singlet states

It is often said that the stable strongly interacting particles (such as the proton and the neutron, i.e. hadrons) observed in nature are "colorless", but more precisely they are in a "color singlet" state, which is mathematically analogous to a spin singlet state. Such states allow interaction with other color singlets, but not with other color states; because long-range gluon interactions do not exist, this illustrates that gluons in the singlet state do not exist either.

The color singlet state is:

( r r ¯ + b b ¯ + g g ¯ ) / 3 . {\displaystyle (r{\bar {r}}+b{\bar {b}}+g{\bar {g}})/{\sqrt {3}}.}

In words, if one could measure the color of the state, there would be equal probabilities of it being red-antired, blue-antiblue, or green-antigreen.

Eight gluon colors

There are eight remaining independent color states, which correspond to the "eight types" or "eight colors" of gluons. Because states can be mixed together as discussed above, there are many ways of presenting these states, which are known as the "color octet". One commonly used list is:

( r b ¯ + b r ¯ ) / 2 {\displaystyle (r{\bar {b}}+b{\bar {r}})/{\sqrt {2}}}        − i ( r b ¯ − b r ¯ ) / 2 {\displaystyle -i(r{\bar {b}}-b{\bar {r}})/{\sqrt {2}}} ( r g ¯ + g r ¯ ) / 2 {\displaystyle (r{\bar {g}}+g{\bar {r}})/{\sqrt {2}}} − i ( r g ¯ − g r ¯ ) / 2 {\displaystyle -i(r{\bar {g}}-g{\bar {r}})/{\sqrt {2}}} ( b g ¯ + g b ¯ ) / 2 {\displaystyle (b{\bar {g}}+g{\bar {b}})/{\sqrt {2}}} − i ( b g ¯ − g b ¯ ) / 2 {\displaystyle -i(b{\bar {g}}-g{\bar {b}})/{\sqrt {2}}} ( r r ¯ − b b ¯ ) / 2 {\displaystyle (r{\bar {r}}-b{\bar {b}})/{\sqrt {2}}} ( r r ¯ + b b ¯ − 2 g g ¯ ) / 6 . {\displaystyle (r{\bar {r}}+b{\bar {b}}-2g{\bar {g}})/{\sqrt {6}}.}

These are equivalent to the Gell-Mann matrices. The critical feature of these particular eight states is that they are linearly independent, and also independent of the singlet state, hence 32 − 1 or 23. There is no way to add any combination of these states to produce any other, and it is also impossible to add them to make rr, gg, or bb the forbidden singlet state. There are many other possible choices, but all are mathematically equivalent, at least equally complicated, and give the same physical results.

Group theory details

Technically, QCD is a gauge theory with SU(3) gauge symmetry. Quarks are introduced as spinors in Nf flavors, each in the fundamental representation (triplet, denoted 3) of the color gauge group, SU(3). The gluons are vectors in the adjoint representation (octets, denoted 8) of color SU(3). For a general gauge group, the number of force-carriers (like photons or gluons) is always equal to the dimension of the adjoint representation. For the simple case of SU(N), the dimension of this representation is N2 − 1.

In terms of group theory, the assertion that there are no color singlet gluons is simply the statement that quantum chromodynamics has an SU(3) rather than a U(3) symmetry. There is no known a priori reason for one group to be preferred over the other, but as discussed above, the experimental evidence supports SU(3). The U(1) group for electromagnetic field combines with a slightly more complicated group known as SU(2) – S stands for "special" – which means the corresponding matrices have determinant 1 in addition to being unitary.

Confinement Main article: Color confinement

Since gluons themselves carry color charge, they participate in strong interactions. These gluon-gluon interactions constrain color fields to string-like objects called "flux tubes", which exert constant force when stretched. Due to this force, quarks are confined within composite particles called hadrons. This effectively limits the range of the strong interaction to 6985100000000000000♠1×10−15 meters, roughly the size of an atomic nucleus. Beyond a certain distance, the energy of the flux tube binding two quarks increases linearly. At a large enough distance, it becomes energetically more favorable to pull a quark-antiquark pair out of the vacuum rather than increase the length of the flux tube.

Gluons also share this property of being confined within hadrons. One consequence is that gluons are not directly involved in the nuclear forces between hadrons. The force mediators for these are other hadrons called mesons.

Although in the normal phase of QCD single gluons may not travel freely, it is predicted that there exist hadrons that are formed entirely of gluons — called glueballs. There are also conjectures about other exotic hadrons in which real gluons (as opposed to virtual ones found in ordinary hadrons) would be primary constituents. Beyond the normal phase of QCD (at extreme temperatures and pressures), quark–gluon plasma forms. In such a plasma there are no hadrons; quarks and gluons become free particles.

Experimental observations

Quarks and gluons (colored) manifest themselves by fragmenting into more quarks and gluons, which in turn hadronize into normal (colorless) particles, correlated in jets. As shown in 1978 summer conferences the PLUTO detector at the electron-positron collider DORIS (DESY) produced the first evidence that the hadronic decays of the very narrow resonance Υ(9.46) could be interpreted as three-jet event topologies produced by three gluons. Later published analyses by the same experiment confirmed this interpretation and also the spin 1 nature of the gluon (see also the recollection and PLUTO experiments).

In summer 1979 at higher energies at the electron-positron collider PETRA (DESY) again three-jet topologies were observed, now interpreted as qq gluon bremsstrahlung, now clearly visible, by TASSO, MARK-J and PLUTO experiments (later in 1980 also by JADE). The spin 1 of the gluon was confirmed in 1980 by TASSO and PLUTO experiments (see also the review). In 1991 a subsequent experiment at the LEP storage ring at CERN again confirmed this result.

The gluons play an important role in the elementary strong interactions between quarks and gluons, described by QCD and studied particularly at the electron-proton collider HERA at DESY. The number and momentum distribution of the gluons in the proton (gluon density) have been measured by two experiments, H1 and ZEUS, in the years 1996-2007. The gluon contribution to the proton spin has been studied by the HERMES experiment at HERA. The gluon density in the proton (when behaving hadronically) also has been measured.

Color confinement is verified by the failure of free quark searches (searches of fractional charges). Quarks are normally produced in pairs (quark + antiquark) to compensate the quantum color and flavor numbers; however at Fermilab single production of top quarks has been shown (technically this still involves a pair production, but quark and antiquark are of different flavor). No glueball has been demonstrated.

Deconfinement was claimed in 2000 at CERN SPS in heavy-ion collisions, and it implies a new state of matter: quark–gluon plasma, less interacting than in the nucleus, almost as in a liquid. It was found at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven in the years 2004–2010 by four contemporaneous experiments. A quark–gluon plasma state has been confirmed at the CERN Large Hadron Collider (LHC) by the three experiments ALICE, ATLAS and CMS in 2010.

The Continuous Electron Beam Accelerator Facility at Jefferson Lab, also called the Thomas Jefferson National Accelerator Facility, in Newport News, Virginia is one of 10 Department of Energy facilities doing research on gluons. The Virginia lab is competing with another facility on Long Island, New York, Brookhaven National Laboratory, for funds to build a new electron-ion collider.

See also
  • Quark
  • Hadron
  • Meson
  • Gauge boson
  • Quark model
  • Quantum chromodynamics
  • Quark–gluon plasma
  • Color confinement
  • Glueball
  • Gluon field
  • Gluon field strength tensor
  • Exotic hadrons
  • Standard Model
  • Three-jet events
  • Deep inelastic scattering
  • Quantum chromodynamics binding energy
References
  1. ^ M. Gell-Mann (1962). "Symmetries of Baryons and Mesons". Physical Review. 125 (3): 1067–1084. Bibcode:1962PhRv..125.1067G. doi:10.1103/PhysRev.125.1067. 
  2. ^ a b c B.R. Stella and H.-J. Meyer (2011). "Υ(9.46 GeV) and the gluon discovery (a critical recollection of PLUTO results)". European Physical Journal H. 36 (2): 203–243. Bibcode:2011EPJH...36..203S. arXiv:1008.1869v3 . doi:10.1140/epjh/e2011-10029-3. 
  3. ^ a b P. Söding (2010). "On the discovery of the gluon". European Physical Journal H. 35 (1): 3–28. Bibcode:2010EPJH...35....3S. doi:10.1140/epjh/e2010-00002-5. 
  4. ^ a b c W.-M. Yao; et al. (Particle Data Group) (2006). "Review of Particle Physics" (PDF). Journal of Physics G. 33: 1. Bibcode:2006JPhG...33....1Y. arXiv:astro-ph/0601168 . doi:10.1088/0954-3899/33/1/001. 
  5. ^ F. Yndurain (1995). "Limits on the mass of the gluon". Physics Letters B. 345 (4): 524. Bibcode:1995PhLB..345..524Y. doi:10.1016/0370-2693(94)01677-5. 
  6. ^ C.R. Nave. "The Color Force". HyperPhysics. Georgia State University, Department of Physics. Retrieved 2012-04-02. 
  7. ^ a b c d e David Griffiths (1987). Introduction to Elementary Particles. John Wiley & Sons. pp. 280–281. ISBN 0-471-60386-4. 
  8. ^ J. Baez. "Why are there eight gluons and not nine?". Retrieved 2009-09-13. 
  9. ^ Ch. Berger; et al. (PLUTO collaboration) (1979). "Jet analysis of the Υ(9.46) decay into charged hadrons". Physics Letters B. 82 (3–4): 449. Bibcode:1979PhLB...82..449B. doi:10.1016/0370-2693(79)90265-X. 
  10. ^ Ch. Berger; et al. (PLUTO collaboration) (1981). "Topology of the Υ decay". Zeitschrift für Physik C. 8 (2): 101. Bibcode:1981ZPhyC...8..101B. doi:10.1007/BF01547873. 
  11. ^ R. Brandelik; et al. (TASSO collaboration) (1979). "Evidence for Planar Events in e+e− Annihilation at High Energies". Physics Letters B. 86 (2): 243–249. Bibcode:1979PhLB...86..243B. doi:10.1016/0370-2693(79)90830-X. 
  12. ^ D.P. Barber; et al. (MARK-J collaboration) (1979). "Discovery of Three-Jet Events and a Test of Quantum Chromodynamics at PETRA". Physical Review Letters. 43 (12): 830. Bibcode:1979PhRvL..43..830B. doi:10.1103/PhysRevLett.43.830. 
  13. ^ Ch. Berger; et al. (PLUTO collaboration) (1979). "Evidence for Gluon Bremsstrahlung in e+e− Annihilations at High Energies". Physics Letters B. 86 (3–4): 418. Bibcode:1979PhLB...86..418B. doi:10.1016/0370-2693(79)90869-4. 
  14. ^ W. Bartel; et al. (JADE collaboration) (1980). "Observation of planar three-jet events in e+e− annihilation and evidence for gluon bremsstrahlung". Physics Letters B. 91: 142. Bibcode:1980PhLB...91..142B. doi:10.1016/0370-2693(80)90680-2. 
  15. ^ R. Brandelik; et al. (TASSO collaboration) (1980). "Evidence for a spin-1 gluon in three-jet events". Physics Letters B. 97 (3–4): 453. Bibcode:1980PhLB...97..453B. doi:10.1016/0370-2693(80)90639-5. 
  16. ^ Ch. Berger; et al. (PLUTO collaboration) (1980). "A study of multi-jet events in e+e− annihilation". Physics Letters B. 97 (3–4): 459. Bibcode:1980PhLB...97..459B. doi:10.1016/0370-2693(80)90640-1. 
  17. ^ G. Alexander; et al. (OPAL collaboration) (1991). "Measurement of Three-Jet Distributions Sensitive to the Gluon Spin in e+e− Annihilations at √s = 91 GeV". Zeitschrift für Physik C. 52 (4): 543. Bibcode:1991ZPhyC..52..543A. doi:10.1007/BF01562326. 
  18. ^ L. Lindeman; et al. (H1 and ZEUS collaborations) (1997). "Proton structure functions and gluon density at HERA". Nuclear Physics B Proceedings Supplements. 64: 179–183. Bibcode:1998NuPhS..64..179L. doi:10.1016/S0920-5632(97)01057-8. 
  19. ^ http://www-hermes.desy.de
  20. ^ C. Adloff; et al. (H1 collaboration) (1999). "Charged particle cross sections in the photoproduction and extraction of the gluon density in the photon". European Physical Journal C. 10: 363–372. Bibcode:1999EPJC...10..363H. arXiv:hep-ex/9810020 . doi:10.1007/s100520050761. 
  21. ^ M. Chalmers (6 March 2009). "Top result for Tevatron". Physics World. Retrieved 2012-04-02. 
  22. ^ M.C. Abreu; et al. (NA50 collaboration) (2000). "Evidence for deconfinement of quark and antiquark from the J/Ψ suppression pattern measured in Pb-Pb collisions at the CERN SpS". Physics Letters B. 477: 28–36. Bibcode:2000PhLB..477...28A. doi:10.1016/S0370-2693(00)00237-9. 
  23. ^ D. Overbye (15 February 2010). "In Brookhaven Collider, Scientists Briefly Break a Law of Nature". New York Times. Retrieved 2012-04-02. 
  24. ^ "LHC experiments bring new insight into primordial universe" (Press release). CERN. 26 November 2010. Retrieved 2016-11-20. 
  25. ^ Nolan, Jim (October 19, 2015). "State hopes for big economic bang as Jeff Lab bids for ion collider". Richmond Times-Dispatch. pp. A1, A7. Retrieved 19 October 2015. Those clues can give scientists a better understanding of what holds the universe together. 
Further reading Wikimedia Commons has media related to Gluons.
  • A. Ali and G. Kramer (2011). "JETS and QCD: A historical review of the discovery of the quark and gluon jets and its impact on QCD". European Physical Journal H. 36 (2): 245–326. Bibcode:2011EPJH...36..245A. arXiv:1012.2288 . doi:10.1140/epjh/e2011-10047-1. 
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Quark-Gluon Plasma
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Did the known Universe really come from nothing? In truth, nobody really knows how the Universe first came into existence. That said, scientists think that an exotic and rare form of pre-matter called quark-gluon plasma may hold the secrets to the origin of the Universe. This essay discusses how QGP may have played a role in what the universe was like in a time before stable atomic nuclei existed just microseconds after the Big Bang. The essay contains references to other literature on this fascinating subject and so would be of 'some' use to students who need to write essays on the topic.

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