Deciphering the Nature of X(3872) in Heavy Ion Collisions
Deciphering the Nature of X(3872) in Heavy Ion Collisions
复制标题
破译重离子碰撞中 X(3872) 的本质
DOI：
10.1103/physrevlett.126.012301
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发表时间：
2021
影响因子：
8.6
通讯作者：
Hongxi Xing
中科院分区：
文献类型：
--
作者：
Hui Zhang;Jinfeng Liao;Enke Wang;Qian Wang;Hongxi Xing
探索X（3872）等奇异多夸克候选者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破译X（3872）态仍然是一个紧迫的悬而未决的问题：松散的强子分子或紧凑的四夸克态。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）生产重离子碰撞，其中一个热火球有足够的光以及魅力（反）夸克是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，并采用适当的分子或四夸克态产生机制，计算和比较了在大型强子对撞机上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）产量和显着不同的强子分子和紧凑的四夸克之间的中心依赖性，从而提供了一个独特的机会区分这两种情况。我们还对X（3872）椭圆流系数作了首次预测，以供将来的实验测量检验。
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.