arXiv 2401.076532024-01nucl-th

中子星与重离子碰撞中超子势刚度与超子组分的关联

Correlation of the hyperon potential stiffness with hyperon constituents in neutron stars and heavy-ion collisions

Si-Na Wei, Zhao-Qing Feng, Wei-Zhou Jiang

备注：: 8 pages, 6 figures
发表信息：: Phys. Lett. B 853 (2024) 138658
DOI：: 10.1016/j.physletb.2024.138658

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AI总结：

本研究探讨味SU(3)对称性破缺下不同硬度的$Λ$超子势对中子星质量及重离子碰撞中超子产额与集体流的影响，发现中心快度区外的$Λ$流对RMF EOS硬度敏感，而高横动量分布同时依赖EOS与超子势刚度。

摘要：

SU(6)对称性破缺为更一般的味SU(3)对称性，可通过调节超子势作为中子星“超子难题”的潜在解释。具体而言，当软的相对论平均场（RMF）$Λ$超子势处于包含两体力的手征SU(3)相互作用NLO13的范围内时，中子星的最大质量预计低于2.0 $M_\odot$；而若RMF $Λ$超子势足够硬，与包含三体力的手征SU(3)相互作用NLO13一致，则其最大质量可超过2.0 $M_\odot$。在涉及这两类$Λ$超子势的研究中，我们探讨了重离子碰撞中超子产额与流受到的影响。我们发现，引入超子势使$Λ$方向流与数据更吻合，但对超子势的硬度缺乏明显区分。硬与软超子势所预测的$Λ$集体流快度分布差异同样微不足道。相反，中心快度区以外的$Λ$集体流对RMF状态方程（EOS）的硬度敏感，且相较于硬RMF EOS更偏好软RMF EOS。值得注意的是，在高横动量下，$Λ$超子产生的横动量分布对RMF EOS的硬度和$Λ$超子势均敏感。

英文摘要：

The breaking of SU(6) symmetry to a more general flavor SU(3) symmetry could serve as a potential explanation for the "hyperon puzzle" of neutron stars by adjusting the hyperon potentials. Specifically, when the soft relativistic mean-field (RMF) $Λ$ hyperon potentials fall within the domains of chiral SU(3) interactions NLO13 with two-body forces, the maximum mass of neutron stars is expected to be lower than 2.0 $M_\odot$, whereas it can exceed $2.0M_\odot$ if the RMF $Λ$ hyperon potentials are sufficiently stiff to be consistent with those from chiral SU(3) interactions NLO13 with three-body forces. In our investigation involving these two types of $Λ$ hyperon potentials, we explore how the hyperon yields and flows are affected in heavy-ion collisions. We find that the inclusion of hyperon potentials results in better agreement of the $Λ$ directed flows with data but without clear differentiation in the stiffness of the hyperon potentials. Similarly negligent is the disparity in the rapidity distributions of the $Λ$ collective flows predicted by the stiff and soft hyperon potentials. In contrast, the $Λ$ collective flows beyond the central rapidity region turn out to be sensitive to the stiffness of the RMF equation of state (EOS) with the preference of a soft RMF EOS to a stiff one. Notably, the transverse momentum distributions of $Λ$ hyperon production are sensitive to both the stiffness of the RMF EOS and $Λ$ hyperon potential at high transverse momenta.

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