Spectrum of the molecular hexaquarks

TL;DR

This paper explores the mass spectra of molecular hexaquark states in dibaryon systems involving charmed baryons, hyperons, and their combinations, revealing numerous potential deuteron-like hexaquarks in heavy flavor sectors.

Contribution

It systematically analyzes all possible molecular hexaquark configurations and connects them with tetraquark and pentaquark states through effective quark interactions.

Findings

Identification of many deuteron-like hexaquarks in heavy flavor sectors.

Establishment of connections among tetraquarks, pentaquarks, and hexaquarks.

Prediction of numerous molecular states near thresholds.

Abstract

We investigate the mass spectra of molecular-type hexaquark states in the dibaryon systems. These systems are composed of the charmed baryons $[\Sigma_c^{(\ast)}$, $\Xi_c^{(\prime,\ast)}]$, doubly charmed baryons $[\Xi_{cc}^{(\ast)}]$, and hyperons $[\Sigma^{(\ast)}$, $\Xi^{(\ast)}]$. We consider all possible combinations of particle-particle and particle-antiparticle pairs, including the S-wave spin multiplets in each combination. We establish the underlying connections among the molecular tetraquarks, pentaquarks, and hexaquarks with the effective quark-level interactions. We find that the existence of molecular states in $DD^\ast$, $D\bar{D}^\ast$, and $\Sigma_c\bar{D}^{(\ast)}$ systems leads to the emergence of a large number of deuteron-like hexaquarks in the heavy flavor sectors. Currently, there have been several experimental candidates for molecular tetraquarks and pentaquarks. The experimental search for near-threshold hexaquarks will further advance the establishment of the underlying dynamical picture of hadronic molecules and deepen our understanding of the role of spin-flavor symmetry in near-threshold residual strong interactions.