过渡从重子到介子冻结出
摘要
The recently discovered sharp peak in the K+/π+ 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 √s_{NN} = 8.16 GeV, temperature T = 140 MeV and baryon chemical potential μ_B = 410 MeV. The maximum in the Λ/π ratio is well reproduced by the statistical model, but the change in the K+/π+ 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 Ξ/π and Ω/π ratios occur at slightly higher beam energies than the maxima for the Λ/π and K+/π+ ratios.
引用
@article{arxiv.hep-ph/0411187,
title = {Transition from Baryonic to Mesonic Freeze-Out},
author = {J. Cleymans and H. Oeschler and K. Redlich and S. Wheaton},
journal= {arXiv preprint arXiv:hep-ph/0411187},
year = {2009}
}
备注
5 pages, 5 postscript figures, uses elsart.sty