Possible triple-charm molecular pentaquarks from ${\Xi }_{cc}{D}_1/{\Xi }_{cc}{D}_2^{\ast }$ interactions

Abstract

In this work, we explore a systematic investigation on $S$-wave interactions between a doubly charmed baryon ${\Xi }_{cc}(3621)$ and a charmed meson in a $T$ doublet $(D_1,D_2^{\ast })$. We first analyze the possibility for forming ${\Xi }_{cc}{D}_1/{\Xi }_{cc}{D}_2^{\ast }$ bound states with the heavy quark spin symmetry. Then, we further perform a dynamical study on the ${\Xi }_{cc}{D}_1/{\Xi }_{cc}{D}_2^{\ast }$ interactions within a one-boson-exchange model by considering both the $S$-$D$ wave mixing and coupled channel effect. Finally, our numerical results conform the proposals from the heavy quark spin symmetry analysis: the ${\Xi }_{cc}{D}_1$ systems with $I(J^P)=$ $0(1/2^{+},3/2^{+})$ and the ${\Xi }_{cc}{D}_2^{\ast }$ systems with $I(J^P)=$ $0(3/2^{+},5/2^{+})$ can possibly be loose triple-charm molecular pentaquarks. Meanwhile, we also extend our model to the ${\Xi }_{cc}{\bar{D}}_1$ and ${\Xi }_{cc}{\bar{D}}_2^{\ast }$ systems, and our results indicate the isoscalars of ${\Xi }_{cc}{\bar{D}}_1$ and ${\Xi }_{cc}{\bar{D}}_2^{\ast }$ can be possible molecular candidates.

Comments: 10 pages, 5 figures, Accepted by PRD