Pseudoscalar neutral mesons in hot and dense matter

Details Pseudoscalar neutral mesons in hot and dense matter Pseudoscalar neutral mesons in hot and dense matter

2002-11-13

arxiv.org/abs/hep-ph/0211203v2

Phys. Lett. B 560 (2003) 171-177

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 4 figures included; revised version with one additional figure, some changes in the discussion, to be published in P

Scientific paper

10.1016/S0370-2693(03)00395-2

The behavior of neutral pseudoscalar mesons $\pi^0, \eta$ and $\eta'$ in hot and dense matter is investigated, in the framework of the three flavor Nambu-Jona-Lasinio model. Three different scenarios are considered: zero density and finite temperature, zero temperature and finite density in a flavor asymmetric medium with and without strange valence quarks, and finite temperature and density. The behavior of mesons is analyzed in connection with possible signatures of restoration of symmetries. In the high density region and at zero temperature it is found that the mass of the $\eta'$ increases, the deviation from the mass of the $\eta$ being more pronounced in matter without strange valence quarks.

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