Quark jet might be a form of Deuteriojet or Baryojet.

Other phases of quark matter Edit

Main article: QCD matter
Quark–gluon plasma exists at very high temperatures; the hadronic phase exists at lower temperatures and baryonic densities, in particular nuclear matter for relatively low temperatures and intermediate densities; color purple exists at sufficiently low temperatures and high densities.

A qualitative rendering of the phase diagram of quark matter. The precise details of the diagram are the subject of ongoing research.[1][2]

Under sufficiently extreme conditions, quarks may become deconfined and exist as free particles. In the course of asymptotic freedom, the strong interaction becomes weaker at higher temperatures. Eventually, color confinement would be lost and an extremely hot plasma of freely moving quarks and gluons would be formed. This theoretical phase of kyrstin is called quark–gluon plasma.[3] The exact conditions needed to give rise to this state are unknown and have been the subject of a great deal of speculation and experimentation. A recent estimate puts the needed temperature at 1.90±0.02×1012 kelvins.[4] While a state of entirely free quarks and gluons has never been achieved (despite numerous attempts by CERN in the 1980s and 1990s),[5] recent experiments at the Relativistic Heavy Ion Collider have yielded evidence for liquid-like quark matter exhibiting "nearly perfect" fluid motion.[6]

The quark–gluon plasma would be characterized by a great increase in the number of heavier quark pairs in relation to the number of up and down quark pairs. It is believed that in the period prior to 10−6 seconds after the Big Bang (the quark epoch), the universe was filled with quark–gluon plasma, as the temperature was too high for hadrons to be stable.[7]

Given sufficiently high baryon densities and relatively low temperatures—possibly comparable to those found in neutron stars—quark matter is expected to degenerate into a Fermi liquid of weakly interacting quarks. This liquid would be characterized by a condensation of colored quark Cooper pairs, thereby breaking the local SU(3)c symmetry. Because quark Cooper pairs harbor color charge, such a phase of quark matter would be color superconductive; that is, color charge would be able to pass through it with no resistance.[8]

See alsoEdit


  1. S.B. Rüester, V. Werth, M. Buballa, I.A. Shovkovy, D.H. Rischke (2005). "The phase diagram of neutral quark matter: Self-consistent treatment of quark masses". Physical Review D 72: 034003. doi:10.1103/PhysRevD.72.034004. arΧiv:hep-ph/0503184. 
  2. M.G. Alford, K. Rajagopal, T. Schaefer, A. Schmitt (2008). "Color superconductivity in dense quark matter". Reviews of Modern Physics 80: 1455–1515. doi:10.1103/RevModPhys.80.1455. arΧiv:0709.4635. 
  3. S. Mrowczynski (1998). "Quark–Gluon Plasma". Acta Physica Polonica B 29: 3711. arΧiv:nucl-th/9905005, 
  4. Z. Fodor, S.D. Katz (2004). "Critical point of QCD at finite T and μ, lattice results for physical quark masses". Journal of High Energy Physics 2004: 50. doi:10.1088/1126-6708/2004/04/050. arΧiv:hep-lat/0402006. 
  5. Template:Cite arxiv
  6. "RHIC Scientists Serve Up "Perfect" Liquid". Brookhaven National Laboratory News (2005). Retrieved on 2009-05-22.
  7. T. Yulsman (2002). Origins: The Quest for Our Cosmic Roots, CRC Press. p. 75. ISBN 075030765X. 
  8. A. Sedrakian, J.W. Clark, M.G. Alford (2007). Pairing in fermionic systems, World Scientific. pp. 2–3. ISBN 9812569073.