论文标题
$ d_s^{（*）} d_s^{（*）} $和$ b_s^{（*）} b_s^{（*）} $的可能分子状态的研究
The study of possible molecular states of $D_s^{(*)}D_s^{(*)}$ and $B_s^{(*)}B_s^{(*)}$
论文作者
论文摘要
最近，LHCB合作报告了一种新的异国情调状态$ t^+_ {cc} $，它被认为是$ d^0d^{*+} $的分子状态（或$ d^{*0} d^{+} $）。 Belle Collaboration also searched for tetraquark state $X_{ccss}$ in $D_sD_s (D^*_sD^*_s )$ final states but no significant signals were observed, which did not rule out the possibility of $X_{ccss}$ to be a molecular state of $D_sD_s (D^*_sD^*_s )$.受这些实验结果的启发，在本文中，我们研究了$ d_s^{（*）} d_s^{（*）$和$ b_s^{（*）} b_s^{（*）} b_s^{（*）} $是否可以使用Beth-salpeter（b-S）等式的方法存在。我们采用一个具有一个玻色子交换近似的重膜手性扰动理论来计算B-S方程中的相互作用内核。我们的数值结果表明，两个$ b_s^{*} $ mesons可能形成$ 0^+$分子状态。未来对$ x_ {ccss} $状态的实验搜索在其他衰减渠道中可能会阐明双重魅力外来状态的结构。
Recently the LHCb collaboration reported a new exotic state $T^+_{cc}$ which is conjectured to be a molecular state of $D^0D^{*+}$ (or $D^{*0}D^{+}$) theoretically. Belle Collaboration also searched for tetraquark state $X_{ccss}$ in $D_sD_s (D^*_sD^*_s )$ final states but no significant signals were observed, which did not rule out the possibility of $X_{ccss}$ to be a molecular state of $D_sD_s (D^*_sD^*_s )$. Inspired by these experimental results on double charmed exotic state, in this paper we study whether the molecular bound states of $D_s^{(*)}D_s^{(*)}$ and $B_s^{(*)}B_s^{(*)}$ can exist with the Bethe-Salpeter (B-S) equation approach. We employ heavy meson chiral perturbation theory with one boson-exchange approximation to calculate the interaction kernels in the B-S equations. Our numerical results suggest that two $B_s^{*}$ mesons perhaps form a $0^+$ molecular state. Future experimental search for $X_{ccss}$ states in other decay channels may shed light on the structure of double charmed exotic state.
