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arXiv 2211.04567nucl-thhep-lathep-ph
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第一性原理格点量子色动力学可调性对强子共振气体相互作用的约束

Constraints on hadron resonance gas interactions via first-principles Lattice QCD susceptibilities

Jamie M. Karthein, Volker Koch, Claudia Ratti, Volodymyr Vovchenko

摘要:

我们研究强子共振气体(HRG)模型的扩展超出了理想的情况下,将吸引力和排斥力的相互作用到模型。当考虑额外的状态超过那些测量的高置信度的粒子数据组,有吸引力的修正HRG模型中的整体压力。另一方面,我们还应用排除体积修正,通过打开排斥(反)重子-(反)重子相互作用来确保重子没有重叠。我们强调这两个扩展的互补性,并确定保守的电荷亲合性的组合,使我们能够单独约束它们。特别是,我们发现有趣的比率,敏感的一个校正,而不是另一个。这允许我们分别约束排除的体积和粒子谱效应。对现有晶格结果的分析表明,在重子奇异性扇区中存在额外的态和排斥重子相互作用,表明超子比非奇异重子具有更小的排斥核。我们注意到,这些结果是有趣的重离子碰撞系统在LHC和RHIC。

英文摘要:

We investigate extensions of the Hadron Resonance Gas (HRG) Model beyond the ideal case by incorporating both attractive and repulsive interactions into the model. When considering additional states exceeding those measured with high confidence by the Particle Data Group, attractive corrections to the overall pressure in the HRG model are imposed. On the other hand, we also apply excluded-volume corrections, which ensure there is no overlap of baryons by turning on repulsive (anti)baryon-(anti)baryon interactions. We emphasize the complementary nature of these two extensions and identify combinations of conserved charge susceptibilities that allow us to constrain them separately. In particular, we find interesting ratios of susceptibilities that are sensitive to one correction and not the other. This allows us to constrain the excluded volume and particle spectrum effects separately. Analysis of the available lattice results suggests the presence of both the extra states in the baryon-strangeness sector and the repulsive baryonic interaction, with indications that hyperons have a smaller repulsive core than non-strange baryons. We note that these results are interesting for heavy-ion-collision systems at both the LHC and RHIC.

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