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arXiv 2007.00053nucl-thhep-exhep-phnucl-ex
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奇异强子的冻结动力学研究

Study of freeze-out dynamics of strange hadrons

Sushant K. Singh, Purabi Ghosh, Jajati K. Nayak

摘要:

本文研究了均匀各向同性膨胀强子系统$π, K, ρ, N, Λ$和净重子密度为零的$Σ$中奇异粒子($K,\, Λ,\, Σ$)的化学冻结动力学。我们使用动量积分玻尔兹曼方程,并研究它们的演化在散装强子物质,一个条件是类似的顶部RHIC和LHC的能量。横截面,这是输入到方程中,采取从现象学模型或参数化,通过与实验数据进行比较。从这个微观计算中,我们发现,这些奇异粒子冻结附近的转变温度$\approx T_c$由于大的弛豫时间。由于温度的逐渐下降和数密度的减小,非弹性过程的持续停止,从而导致奇异强子$K, Λ$和$Σ$的提前冻结,并在$T_c$附近相继发生。然而,这些奇怪的物种在Tc附近的冻结似乎是一个突然的和同时发生的过程,这主要是由热模型预测,同时解释了在RHIC和LHC能量的识别粒子的产量。

英文摘要:

We study the chemical freeze-out dynamics of strange particles ($K,\, Λ,\, Σ$) from a homogeneous and isotropically expanding hadronic system of $π, K, ρ, N, Λ$ and $Σ$ with zero net baryon density. We use the momentum integrated Boltzmann equation and study their evolution over the bulk hadronic matter, a condition being similar to the one created at top RHIC and LHC energies. The cross-sections, which are input to the equations, are taken either from phenomenological models or parameterized by comparing against experimental data. From this microscopic calculation we find that these strange particles freeze-out near transition temperature $\approx T_c$ due to large relaxation time. The continuous cease of the inelastic processes due to gradual fall in the temperature and decrease in the number density, thus lead to early freeze out of strange hadrons $K, Λ$ and $Σ$ which happens sequentially near $T_c$. However, freeze-out of these strange species near Tc appears as a sudden and simultaneous process, which is mostly predicted by thermal model while explaining the yield of identified particles at RHIC and LHC energies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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