Transition from Baryonic to Mesonic Freeze-Out

Details Transition from Baryonic to Mesonic Freeze-Out Transition from Baryonic to Mesonic Freeze-Out

2004-11-13

arxiv.org/abs/hep-ph/0411187v4

Phys.Lett. B615 (2005) 50-54

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 5 postscript figures, uses elsart.sty

Scientific paper

10.1016/j.physletb.2005.03.074

The recently discovered sharp peak in the K+/pi+ ratio is discussed in the framework of the statistical model. In this model a rapid change is expected as the hadronic gas undergoes a transition from a baryon-dominated to a meson-dominated gas. The transition happens at sqrt{s_{NN}} = 8.16 GeV, temperature T = 140 MeV and baryon chemical potential mu_B = 410 MeV. The maximum in the Lambda/pi ratio is well reproduced by the statistical model, but the change in the K+/pi+ ratio is much less pronounced than the one observed by the NA49 collaboration. Further experimental tests are proposed to clarify the nature of the transition. In particular, the maxima expected in the statistical model for the Xi/pi and Omega/pi ratios occur at slightly higher beam energies than the maxima for the Lambda/pi and K+/pi+ ratios.

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