arXiv 0803.24212008-03-17hep-ph

排除体积模型中的粒子多重数和粒子比

Particle multiplicities and particle ratios in excluded volume model

M. Mishra, C. P. Singh

备注：: 15 pages, 12 figures
发表信息：: Phys.Rev.C78:024910,2008
DOI：: 10.1103/PhysRevC.78.024910

摘要：

最令人惊讶的结果之一是发现，从最低的AGS到最高的RHIC能量的粒子多重性和粒子比的所有实验结果的一致描述是可能的热统计模型的框架内。本文提出了一个包含相互作用多组分强子气体的物理相容的排斥体积模型。我们发现，在这个模型中得到的奇异和非奇异强子的总多重数的能量依赖关系与实验结果非常一致。这表明，火球的冻结体积对于所有粒子都是一致的。我们还比较了粒子比如$<K^{+}>/<π^{+}>, < K^{-}>/<π^{-}>, K^{-}/K^{+}, \bar{p}/p, \barΛ/Λ, \barΞ/Ξ, \barΩ/Ω, < Λ>/<π>, <Ξ^{-}>/<π>, <Ω+\barΩ>/<π>$和$<Φ>/<π>$相对于质心能量的变化，我们的模型预测与最近的实验数据。

英文摘要：

One of the most surprising results is to find that a consistent description of all the experimental results on particle multiplicities and particle ratios obtained from the lowest AGS to the highest RHIC energies is possible within the framework of a thermal statistical model. We propose here a thermodynamically consistent excluded-volume model involving an interacting multi-component hadron gas. We find that the energy dependence of the total multiplicities of strange and non-strange hadrons obtained in this model agrees closely with the experimental results. It indicates that the freeze out volume of the fireball is uniformly the same for all the particles. We have also compared the variation of the particle ratios such as $<K^{+}>/<π^{+}>, < K^{-}>/<π^{-}>, K^{-}/K^{+}, \bar{p}/p, \barΛ/Λ, \barΞ/Ξ, \barΩ/Ω, < Λ>/<π>, <Ξ^{-}>/<π>, <Ω+\barΩ>/<π>$ and $<Φ>/<π>$ with respect to the center-of-mass energy as predicted by our model with the recent experimental data.

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摘要：

英文摘要：

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