论文标题
建立$ x（3872）$，$ z_c（3900）$和$ x（3960）$的重型夸克旋转和轻巧的味道分子多重
Establishing the heavy quark spin and light flavor molecular multiplets of the $X(3872)$, $Z_c(3900)$ and $X(3960)$
论文作者
论文摘要
最近，LHCB合作报告了$ d_s^+d_s^ - $不变的质量分配中的$ x（3960）$ $ x（3960）$。我们表明，数据可以通过$ d_s^+d_s^ - $阈值以下的界限或虚拟状态进行很好的描述。杆位置给出的质量为$（3928 \ pm3）$ MEV。使用此质量以及有关$ x（3872）$和$ z_c（3900）$ resonances的现有信息，这是由一对基态和抗训练的介子形成的$ s $ - 波的辐射分子的完整谱。因此，预测$ x（3872）$，$ z_c（3900）$和新观察到的$ d_s^+d_s^ - $状态的合作伙伴的极点位置。计算是在非依赖性有效场理论的领先顺序进行的，并考虑了重夸克旋转和浅色su（3）对称性，尽管提供了这些对称性的保守误差。
Recently, the LHCb Collaboration reported a near-threshold enhancement, $X(3960)$, in the $D_s^+D_s^-$ invariant mass distribution. We show that the data can be well described by either a bound or a virtual state below the $D_s^+D_s^-$ threshold. The mass given by the pole position is $(3928\pm3)$ MeV. Using this mass and the existing information on the $X(3872)$ and $Z_c(3900)$ resonances, a complete spectrum of the $S$-wave hadronic molecules formed by a pair of ground state charmed and anticharmed mesons is established. Thus, pole positions of the partners of the $X(3872)$, $Z_c(3900)$ and the newly observed $D_s^+D_s^-$ state are predicted. Calculations have been carried out at the leading order of nonrelativistic effective field theory and considering both heavy quark spin and light flavor SU(3) symmetries, though conservative errors from the breaking of these symmetries are provided.
