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arXiv 2104.12754hep-phnucl-exnucl-th
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统计强子化模型中的多粲层次

The multiple-charm hierarchy in the statistical hadronization model

Anton Andronic, Peter Braun-Munzinger, Markus K. Köhler, Aleksas Mazeliauskas, Krzysztof Redlich, Johanna Stachel, Vytautas Vislavicius

摘要:

在相对论性核碰撞中,强子与轻(u、d、s)夸克的产生在统计强子化模型(SHM)的框架下进行了定量描述。粲夸克主要产生于初始硬碰撞,但在热火球中强烈相互作用并热化。因此,粲强子可以纳入SHM处理的魅力夸克作为“杂质”的热分布,而火球的总魅力内容是固定的测量开放的魅力截面。我们称这个模型为SHMc,并证明了SHMc的铅-铅碰撞在LHC能量的单粲强子的多重性的测量可以很好地描述与(u,d,s)强子相同的热参数。此外,横向动量分布计算在一个爆炸波模型,其中包括共振衰减运动学。SHMc扩展到更轻的碰撞系统,直到氧-氧,包括双粲和三粲强子。我们预测这种状态的生产概率表现出一个特征和相当壮观的增强层次。

英文摘要:

In relativistic nuclear collisions the production of hadrons with light (u,d,s) quarks is quantitatively described in the framework of the Statistical Hadronization Model (SHM). Charm quarks are dominantly produced in initial hard collisions but interact strongly in the hot fireball and thermalize. Therefore charmed hadrons can be incorporated into the SHM by treating charm quarks as 'impurities' with thermal distributions, while the total charm content of the fireball is fixed by the measured open charm cross section. We call this model SHMc and demonstrate that with SHMc the measured multiplicities of single charm hadrons in lead-lead collisions at LHC energies can be well described with the same thermal parameters as for (u,d,s) hadrons. Furthermore, transverse momentum distributions are computed in a blast-wave model, which includes the resonance decay kinematics. SHMc is extended to lighter collision systems down to oxygen-oxygen and includes doubly- and triply-charmed hadrons. We show predictions for production probabilities of such states exhibiting a characteristic and quite spectacular enhancement hierarchy.

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