相对论性重离子碰撞中Λ和Λ极化的改进核-电晕模型

A. Ayala, I. Dominguez, I. Maldonado, M. Tejeda-Yeomans
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引用次数: 1

摘要

由于其对极端条件下强相互作用物质动力学的敏感性,超子整体极化已成为研究相对论重离子碰撞中产生的系统的重要观测值。最近,STAR和HADES合作测量了在大范围碰撞能量的半中心碰撞中产生的Λ和Λ¯的全球极化。随着碰撞能量的减小,极化激发函数呈增大趋势,其中Λ¯的增大更为明显。在这项工作中,我们总结了我们开发的核心-日冕模型,该模型用于量化火球不同区域中Λ和Λ¯产生的全球极化贡献。核心-电晕模型假设在高密度的核心和低密度的电晕两个区域都产生Λs和Λ¯s,它们的相对丰度不同,从而调节了极化激发函数。结果表明,该模型能很好地描述实验结果。利用该模型计算的全局极化激发函数在sNN≤10 GeV区域出现不同碰撞能量下的峰值。最后,我们讨论并报道了FAIR和HADES能量下BES-II、NICA和CBM的模式全球极化预测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Improved Core-Corona Model for Λ and Λ Polarization in Relativistic Heavy-Ion Collisions
Due to its sensitivity to the dynamics of strongly interacting matter subject to extreme conditions, hyperon global polarization has become an important observable to study the system created in relativistic heavy-ion collisions. Recently, the STAR and HADES collaborations have measured the global polarization of both Λ and Λ¯ produced in semi-central collisions in a wide range of collision energies. The polarization excitation functions show an increasing trend as the collision energy decreases, with the increase being more pronounced for the Λ¯. In this work, we make a summary of a core-corona model that we have developed to quantify the global polarization contributions from Λ and Λ¯ created in different regions of the fireball. The core-corona model assumes that Λs and Λ¯s are produced in both regions, the high-density core and the lower density corona, with different relative abundances which modulate the polarization excitation function. We have shown that the model works well for the description of experimental results. The global polarization excitation functions computed with the model show a peak at different collision energies in the region sNN≤10 GeV. Finally, we discuss and report on the model global polarization predictions for BES-II, NICA and CBM at FAIR and HADES energies.
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