arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.01750nucl-thhep-exhep-ph
收藏

强子碰撞中核的起源--并合

On coalescence as the origin of nuclei in hadronic collisions

Francesca Bellini, Kfir Blum, Alexander Phillip Kalweit, Maximiliano Puccio

备注：
24 pages, 10 figures
发表信息：
Phys. Rev. C 103, 014907 (2021)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

强子碰撞中弱束缚核团簇的起源是重离子碰撞（HIC）实验要解决的一个关键问题。集群的测量产量是近似一致的预期从唯象统计强子化模型（SHMs），但缺乏理论上的理解动力学冻结之前的团簇形成。竞争模型是核聚结，它将团簇形成归因于原子核从动力学冻结到观察者的传播过程中的终态相互作用（FSI）的影响。这一现象与FSI在小相对动量差下连续对粒子间的飞秒关联中的作用密切相关。我们给出了一个简洁的理论推导的合并-相关关系，预测核集团光谱的飞秒测量。我们回顾的事实，聚结来自相对论Bethe-Salpeter方程，并回顾如何有效的量子力学控制集群粒子的动力学，是非相对论的集群中心的质量框架。我们表明，聚结相关关系是大致一致的系统中观察到的集群光谱范围从PbPb到pPb和PP碰撞。特别注意核的波函数，我们推导出的合并预测hypertriton和显示，它也是大致符合的数据。我们的工作激发了一个联合实验计划，解决飞秒和集群生产下一个统一的框架。即将到来的pp，pPb和周边PbPb数据分析在这样一个程序中可以严格测试聚结集群的起源。

英文摘要：

The origin of weakly-bound nuclear clusters in hadronic collisions is a key question to be addressed by heavy-ion collision (HIC) experiments. The measured yields of clusters are approximately consistent with expectations from phenomenological statistical hadronisation models (SHMs), but a theoretical understanding of the dynamics of cluster formation prior to kinetic freeze out is lacking. The competing model is nuclear coalescence, which attributes cluster formation to the effect of final state interactions (FSI) during the propagation of the nuclei from kinetic freeze out to the observer. This phenomenon is closely related to the effect of FSI in imprinting femtoscopic correlations between continuum pairs of particles at small relative momentum difference. We give a concise theoretical derivation of the coalescence--correlation relation, predicting nuclear cluster spectra from femtoscopic measurements. We review the fact that coalescence derives from a relativistic Bethe-Salpeter equation, and recall how effective quantum mechanics controls the dynamics of cluster particles that are nonrelativistic in the cluster centre of mass frame. We demonstrate that the coalescence--correlation relation is roughly consistent with the observed cluster spectra in systems ranging from PbPb to pPb and pp collisions. Paying special attention to nuclear wave functions, we derive the coalescence prediction for hypertriton and show that it, too, is roughly consistent with the data. Our work motivates a combined experimental programme addressing femtoscopy and cluster production under a unified framework. Upcoming pp, pPb and peripheral PbPb data analysed within such a programme could stringently test coalescence as the origin of clusters.

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。

↑