From the isovector molecular explanation of the newly $T_{c\bar{s}}^{a0(++)}(2900)$ to possible charmed-strange molecular pentaquarks

Abstract

In this work, we adopt the one-boson-exchange model to study the $D^{(*)}K^{(*)}$ interactions. With the same parameters, we can simultaneously reproduce the masses of the $D_{s0}(2317)$, $D_{s1}(2460)$, and $T_{c\bar{s}}^{a0(++)}(2900)$ recently observed by the LHCb collaboration in the hadronic molecular picture, where the $D_{s0}(2317)$, $D_{s1}(2460)$, and $T_{c\bar{s}}^{a0(++)}(2900)$ are regarded as the $DK[I(J^P)=0(0^+)]$, $D^*K[0(1^+)]$, and $D^*K^*[1(0^+)]$ charmed-strange molecular states, respectively. In addition, we extend to study the $\Lambda_cK^{(*)}$ and $\Sigma_cK^{(*)}$ interactions and predict two possible charmed-strange molecular pentaquarks, the single $\Sigma_cK^*$ state with $I(J^P)=1/2(1/2^-)$ and $3/2(3/2^-)$. After considering the coupled channel effects, our results show that the coupled $\Lambda_cK^*/\Sigma_cK^*$ molecular state with $I(J^P)=1/2(1/2^-)$ and the coupled $\Sigma_cK/\Lambda_cK^*$ molecular state with $I(J^P)=1/2(1/2^-)$ can be good hadronic molecular candidates, the $\Lambda_cK^*({}^2S_{1/2})$ and $\Sigma_cK({}^2S_{1/2})$ are the dominant channels, respectively.