arXiv 2208.069602022-08hep-phnucl-th

$X(3872)$和$T_{cc}$：重离子碰撞中的结构和产物

$X(3872)$ and $T_{cc}$: structures and productions in heavy ion collisions

Hyeongock Yun, Daeho Park, Sungsik Noh, Aaron Park, Woosung Park, Sungtae Cho, Juhee Hong, Yongsun Kim, Sanghoon Lim, Su Houng Lee

备注：: 9 pages, 3 figures
DOI：: 10.1103/PhysRevC.107.014906

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摘要：

我们讨论了为什么最近观察到的$T_{cc}$可能是一个紧凑的多夸克配置或一个松散的束缚的分子配置组成的粲介子，而$X(3872)$是最有可能的分子配置。该论点是基于不同的短程相互作用的这些四夸克态来自颜色和颜色自旋相互作用的夸克模型，并存在一个共同的强D波混频在更大的距离类似于氘核的情况下，这对于分子配置导致大尺寸。这样一个类比在大的距离，使我们能够计算的横向动量依赖的松散结合的分子配置的四夸克在重离子碰撞使用聚结模型，成功地再现了使用质子光谱的氘数据。从我们的方法得到的积分$X(3872)$产额的比例，从统计强子化模型方法得到的$ψ(2S)$产额计算为$0.806 \pm 0.234$，这是一个2.47倍，大于通过使用统计模型预测的粒子和从CMS实验的数据。由于先前计算的$T_{cc}$的横向动量分布假设的结构是一个紧凑的多夸克配置是显着不同的，实验测量的横向分布的四夸克态将区分它们的两种可能的结构。

英文摘要：

We argue why the recently observed $T_{cc}$ could either be a compact multiquark configuration or a loosely bound molecular configuration composed of charmed mesons, whereas the $X(3872)$ is most likely a molecular configuration. The argument is based on different short range interactions for these tetraquark states coming from the color-color and color-spin interaction in a quark model, and the presence of a common strong D-wave mixing at larger distance similar to the deuteron case, which for the molecular configurations lead to large sizes. Such an analogy at large distance allows us to calculate the transverse momentum dependence of the loosely bound molecular configuration of tetraquarks produced in heavy ion collisions using the coalescence model that successfully reproduces the deutron data using the proton spectra. The ratio of the integrated $X(3872)$ yield obtained from our method to the $ψ(2S)$ yield obtained from statistical hadronization model method is calculated to be $0.806 \pm 0.234$, which is a factor of 2.47 larger than that obtained by using statistical model predictions for both particles and in line with the data from the CMS experiment. As the previously calculated transverse momentum distribution of the $T_{cc}$ assuming the structure to be a compact multiquark configuration is markedly different, experimental measurements of the transverse distribution of the tetraquark states will discriminate between their two possible structures.

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