Faculty of Physics, Hanoi University of Science

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New Particle Hints at Four-Quark Matter

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Eric Swanson, University of Pittsburgh, Pittsburgh, PA 15260, USA

Published June 17, 2013  | Physics 6, 69 (2013) |  DOI: 10.1103/Physics.6.69

"Two experiments have detected the signature of a new particle, which may combine quarks in a way not seen before.

Particle physicists seem to have a pretty good handle on the fundamental particles of the universe, but there are some glaring holes in this understanding. Quarks are a good example of this. We know that all nuclear matter is made up of quarks, and we have a pretty good understanding of how two quarks interact at close range. But our quark theory cannot tell us which quark combinations will result in a bound particle or a stable nuclei. All we can go on is experience, and experience has shown that particles with four quarks do not exist. But the situation may have changed with the possible discovery of a new particle containing at least four quarks. Two separate groups, both reporting in Physical Review Letters, have seen evidence for this strange particle, called Z c (3900). Although the data is open to other interpretations, it’s clear that our understanding of quarks has a long way to go."  ----Physics 6, 69 (2013)

 

Figure 1

 

Figure 1 The quark wing of the particle zoo includes (a) quark pairs called mesons, (b) quark triplets called baryons, and possibly (c) four-quark combinations that may explain the Zc(3900) observations. APS/Alan Stonebraker

 

For full information, please visit at http://physics.aps.org/articles/v6/69

Two mentioned PRL papers:

#1http://prl.aps.org/abstract/PRL/v110/i25/e252001 or http://arxiv.org/abs/1303.5949

 

#2http://prl.aps.org/abstract/PRL/v110/i25/e252002 or http://arxiv.org/abs/1304.0121