Possible charmed-strange molecular dibaryons

TL;DR

This paper explores the possibility of charmed-strange molecular dibaryons with charm number 1 and strangeness ±1, using effective Lagrangians and Bethe-Salpeter equations to identify potential bound states from baryon interactions.

Contribution

It systematically investigates charmed-strange dibaryons through a coupled-channel approach with effective potentials, predicting potential molecular states.

Findings

Attractions are widespread in the C=1, S=-1 systems.

S-wave bound states are likely in most channels.

Few bound states are found in charmed-antistrange interactions.

Abstract

In this work, we systematically investigate the dibaryons with charm number $C$=1 and strangeness number $S$=$\pm$ 1 from the interactions of a charmed baryon and a strange baryon $\Lambda_c\Lambda$, $\Lambda_c\Sigma^{(*)}$, $\Sigma_c^{(*)}\Lambda$, and $\Sigma^{(*)}_c\Sigma^{(*)}$, and corresponding interactions of a charmed baryon and an antistrange baryon $\Lambda_c\bar{\Lambda}$, $\Lambda_c\bar{\Sigma}^{(*)}$, $\Sigma^{(*)}_c\bar{\Lambda}$, and $\Sigma^{(*)}_c\bar{\Sigma}^{(*)}$. With the help of the effective Lagrangians with $SU(3)$, heavy quark, and chiral symmetries, the potentials of the interactions considered are constructed by light meson exchanges. To search for the possible molecules, the quasipotential Bethe-Salpeter equation with the interaction potential kernel is solved to find poles from scattering amplitude. The results suggest that attractions widely exist in charmed-strange system with $C$=1 and $S$=$-1$. The $S$-wave bound states can be produced from most of the channels. Few bound states are also produced from the charmed-antistrange interactions. Couple-channel effect are considered in the current work to discuss the couplings of the molecular states to the channels considered. More experimental research for these charmed-strange dibaryons are suggested.