论文标题
Tetraquark $ \ bar c \ bar s qq $状态的质谱和强烈的衰减
Mass spectrum and strong decays of tetraquark $\bar c\bar s qq$ states
论文作者
论文摘要
我们系统地研究了S-Wave $ \ bar c \ bar s Q Q $状态的质谱和较强的衰减。该模型的关键成分是库仑，线性限制和超细相互作用。超细电位导致不同颜色配置之间的混合，以及在两个基态之间以$ i（j^p）= 0（0^+）$和$ i（j^p）= 1（0^+）$之间的大质量分裂。我们将它们的强衰变振幅计算到$ \ bar d^{（*）} k^{（*）} $通道中，具有从质谱计算和夸克交换方法中的波函数。我们研究了最近观察到的$ x_0（2900）$作为四夸克州的解释。 $ i（j^p）的质量和衰减宽度= 1（0^+）$状态为$ m = 2941 $ meV和$γ_x= 26.6 $ MEV，这表明它可能是$ x_0（2900）$的良好候选者。同时，我们还获得了一个isospin合作伙伴状态$ i（j^p）= 0（0^+）$，$ m = 2649 $ meV和$γ_{x \ rightarrow \ bar d k} = 48.1 $ meV。对$ X（2649）$的未来实验搜索将非常有帮助。
We systematically study the mass spectrum and strong decays of the S-wave $\bar c\bar s q q$ states in the compact tetraquark scenario with the quark model. The key ingredients of the model are the Coulomb, the linear confinement, and the hyperfine interactions. The hyperfine potential leads to the mixing between different color configurations, as well as the large mass splitting between the two ground states with $I(J^P)=0(0^+)$ and $I(J^P)=1(0^+)$. We calculate their strong decay amplitudes into the $\bar D^{(*)}K^{(*)}$ channels with the wave functions from the mass spectrum calculation and the quark interchange method. We examine the interpretation of the recently observed $X_0(2900)$ as a tetraquark state. The mass and decay width of the $I(J^P)=1(0^+)$ state are $M=2941$ MeV and $Γ_X=26.6$ MeV, respectively, which indicates that it might be a good candidate for the $X_0(2900)$. Meanwhile, we also obtain an isospin partner state $I(J^P)=0(0^+)$ with $M=2649$ MeV and $Γ_{X\rightarrow \bar D K}=48.1$ MeV, respectively. Future experimental search for $X(2649)$ will be very helpful.
