$$X(3872)$$transport in heavy-ion collisions
$$X(3872)$$transport in heavy-ion collisions
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DOI：
10.1140/epja/s10050-021-00435-6
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
Biaogang Wu;Xiaojian Du;M. Sibila;R. Rapp
中科院分区：
文献类型：
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作者：
Biaogang Wu;Xiaojian Du;M. Sibila;R. Rapp
在重离子碰撞中产生的粒子被认为是探测其内部结构的另一种方法。为了研究这一猜想，我们在LHC上进行了通过核碰撞形成的火球的输运计算。在以前用于charmonia的动力学速率方程方法中，它们的形成和解离受两个传输参数控制，即，它的非弹性反应速率和热平衡极限在不断发展的热QCD介质。虽然平衡极限由原初核子-核子碰撞中的粲产生截面（以及介质中的粲态谱）控制，但结构信息被编码在反应速率中。我们研究了不同的情况下的速率如何影响的中心依赖性和横向动量（）谱。与松散结合的分子结构相关的较大反应速率意味着它在火球演化中比四夸克形成得晚，因此它的最终产额通常要小大约两倍，这与迄今为止大多数聚并模型的计算有质的不同。这些光谱提供了进一步的信息，因为在分子场景中，较晚的去耦时间导致了由膨胀火球的蓝移引起的更硬的光谱。
The production of theparticle in heavy-ion collisions has been contemplated as an alternative probe of its internal structure. To investigate this conjecture, we perform transport calculations of thethrough the fireball formed in nuclear collisions at the LHC. Within a kinetic-rate equation approach as previously used for charmonia, the formation and dissociation of theis controlled by two transport parameters,i.e., its inelastic reaction rate and thermal-equilibrium limit in the evolving hot QCD medium. While the equilibrium limit is controlled by the charm production cross section in primordial nucleon-nucleon collisions (together with the spectra of charm states in the medium), the structure information is encoded in the reaction rate. We study how different scenarios for the rate affect the centrality dependence and transverse-momentum () spectra of the. Larger reaction rates associated with the loosely bound molecule structure imply that it is formed later in the fireball evolution than the tetraquark and thus its final yields are generally smaller by around a factor of two, which is qualitatively different from most coalescence model calculations to date. Thespectra provide further information as the later decoupling time within the molecular scenario leads to harder spectra caused by the blue-shift from the expanding fireball.