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arXiv 2004.00024hep-phhep-exnucl-exnucl-th
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解读重离子碰撞中X（3872）的性质

Deciphering the nature of X(3872) in heavy ion collisions

Hui Zhang, Jinfeng Liao, Enke Wang, Qian Wang, Hongxi Xing

备注：
5 pages, 5 figures, published version in Phys. Rev. Lett
发表信息：
Phys. Rev. Lett. 126, 012301 (2021)
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摘要：

探索奇异多夸克候选者（如$X(3872)$）的性质在理解量子色动力学（QCD）中起着关键作用。尽管作出了重大努力，但仍缺乏关于其内部结构的共识。作为一个最好的例子，在两种流行的奇异构型之间（松散的强子分子或紧凑的四夸克态），破译$X(3872)$态仍然是一个紧迫的悬而未决的问题。我们展示了一种新的方法来帮助解决这个问题，通过研究$X(3872)$生产在重离子碰撞，在那里一个热的火球有足够的光，以及魅力（反）夸克可用于生产的异国情调。采用多相输运模型（AMPT）描述这类碰撞，并采用合适的分子或四夸克态产生机制，计算和比较了大型强子对撞机上Pb-Pb碰撞中$X(3872)$的一系列观测值.我们发现火球体积起着至关重要的作用，导致2个数量级的差异，在$X(3872)$产量和强子分子和紧凑的四夸克之间的中心依赖性显着不同，从而提供了一个独特的机会，区分这两种情况。我们还首次预测了$X(3872)$椭圆流系数，并通过实验测量进行了验证。

英文摘要：

Exploring the nature of exotic multiquark candidates such as the $X(3872)$ plays a pivotal role in understanding quantum chromodynamics (QCD). Despite significant efforts, consensus on their internal structures is still lacking. As a prime example, it remains a pressing open question to decipher the $X(3872)$ state between two popular exotic configurations: a loose hadronic molecule or a compact tetraquark. We demonstrate a novel approach to help address this problem by studying the $X(3872)$ production in heavy ion collisions, where a hot fireball with ample light as well as charm (anti-)quarks is available for producing the exotics. Adopting a multiphase transport model (AMPT) for describing such collisions and implementing appropriate production mechanism of either molecule or tetraquark picture, we compute and compare a series of observables for $X(3872)$ in Pb-Pb collisions at the Large Hadron Collider. We find the fireball volume plays a crucial role, leading to a 2-order-of-magnitude difference in the $X(3872)$ yield and a markedly different centrality dependence between hadronic molecules and compact tetraquarks, thus offering a unique opportunity for distinguishing the two scenarios. We also make the first prediction of $X(3872)$ elliptic flow coefficient to be tested by future experimental measurements.

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。

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