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arXiv 1701.04816hep-ph
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高能奇异产生现象学

Phenomenology of strangeness production at high energies

Abdel Nasser Tawfik, Hayam Yassin, Eman R. Abo Elyazeed, Muhammad Maher, Abdel Magied Diab, Magda Abdel Wahab, Eiman Abou El Dahab

摘要:

奇异夸克占据因子($γ_s$)由多重数比$\mathrm{K}^+/π^+$在较宽核子-核子质心能量($\sqrt{s_{NN}}$)范围内的统计拟合确定。从这个单奇异夸克子系统出发,将$γ_s(\sqrt{s_{NN}})$参数化为阻尼三角函数,并成功地应用于化学半平衡态的强子共振气体模型。包括$\mathrm{K}^-/π^-$、$\mathrmΛ/π^-$和$\mathrm{\barΛ}/π^-$在内的各种颗粒比例都得到了很好的再现。$γ_s(\sqrt{s_{NN}})$的唯象学表明,在$\sqrt{s_{NN}} \simeq 7~$ GeV的强子($γ_s$升高)似乎经历了一个相变到一个混合相($γ_s$下降),然后在$\sqrt{s_{NN}} \simeq 20~$ GeV的部分子($γ_s$保持不变,而$\sqrt{s_{NN}}$增加)。

英文摘要:

The strange-quark occupation factor ($γ_s$) is determined from the statistical fit of the multiplicity ratio $\mathrm{K}^+/π^+$ in a wide range of nucleon-nucleon center-of-mass energies ($\sqrt{s_{NN}}$). From this single-strange-quark-subsystem, $γ_s(\sqrt{s_{NN}})$ was parametrized as a damped trigonometric functionality and successfully implemented to the hadron resonance gas model, at chemical semi-equilibrium. Various particle ratios including $\mathrm{K}^-/π^-$, $\mathrmΛ/π^-$, and $\mathrm{\barΛ}/π^-$ are well reproduced. The phenomenology of $γ_s(\sqrt{s_{NN}})$ suggests that, the hadrons ($γ_s$ raises) at $\sqrt{s_{NN}} \simeq 7~$GeV seems to undergo a phase transition to a mixed phase ($γ_s$ declines), which is then derived into partons ($γ_s$ remains unchanged with increasing $\sqrt{s_{NN}}$), at $\sqrt{s_{NN}} \simeq 20~$GeV.

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