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 $D^{(\ast )}{K}^{(\ast )}$ 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 $DK[I(J^P)=0(0^{+})]$, $D^{\ast }K[0(1^{+})]$, and $D^{\ast }{K}^{\ast }[1(0^{+})]$ charmed-strange molecular states, respectively. In addition, we extend to study the ${\Lambda }_c{K}^{(\ast )}$ and ${\Sigma }_c{K}^{(\ast )}$ interactions and predict two possible charmed-strange molecular pentaquarks, the single ${\Sigma }_c{K}^{\ast }$ 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 ${\Lambda }_c{K}^{\ast }/{\Sigma }_c{K}^{\ast }$ molecular state with $I(J^P)=1/2(1/2^{-})$ and the coupled ${\Sigma }_{c}K/{\Lambda }_c{K}^{\ast }$ molecular state with $I(J^P)=1/2(1/2^{-})$ can be good hadronic molecular candidates, the ${\Lambda }_c{K}^{\ast }({}^2{S}_{1/2})$ and ${\Sigma }_{c}K({}^2{S}_{1/2})$ are the dominant channels, respectively.

Comments: 8 pages, 2 figures