标题： $Z_{cs}(3985)$的轴矢四夸克态分析 显示英文标题

标题： Analysis of the $Z_{cs}(3985)$ as the axialvector tetraquark state

摘要： 在本文中，我们选择颜色反三重态中的标量和矢量二夸克算符作为基本构建块，构建四夸克流，并在QCD求和规则框架下研究二夸克-反二夸克类型的矢量四夸克态$c\bar{c}u\bar{s}$。 预测的四夸克质量$M_Z=3.99\pm0.09\,\rm{GeV}$与BESIII合作组的实验值$3985.2^{+2.1}_{-2.0}\pm1.7\,\rm{MeV}$非常吻合，这支持将$Z_{cs}(3985)$识别为具有量子数$J^{PC}=1^{+-}$的$Z_c(3900)$的同位体。 我们考虑轻味$SU(3)$质量破缺效应，根据之前的工作估算具有奇异数的二夸克-反二夸克类型隐藏底四夸克态的质量谱。 显示英文摘要

摘要： In this paper, we choose the scalar and axialvector diquark operators in the color antitriplet as the fundamental building blocks to construct the four-quark currents and investigate the diquark-antidiquark type axialvector tetraquark states $c\bar{c}u\bar{s}$ in the framework of the QCD sum rules. The predicted tetraquark mass $M_Z=3.99\pm0.09\,\rm{GeV}$ is in excellent agreement with the experimental value $3985.2^{+2.1}_{-2.0}\pm1.7\,\rm{MeV}$ from the BESIII collaboration, which supports identifying the $Z_{cs}(3985)$ as the cousin of the $Z_c(3900)$ with the quantum numbers $J^{PC}=1^{+-}$. We take into account the light flavor $SU(3)$ mass-breaking effect to estimate the mass spectrum of the diquark-antidiquark type hidden-charm tetraquark states having the strangeness according to the previous works.