Doubly-Charm and Doubly-Bottom Pentaquark molecular States via the QCD sum rules

TL;DR

This paper uses QCD sum rules to predict the masses of doubly-charm and doubly-bottom pentaquark molecular states, suggesting they are bound states below meson-baryon thresholds and exploring their possible decay channels.

Contribution

It constructs specific currents to study these states and provides mass predictions indicating they are likely bound states, advancing understanding of doubly-heavy pentaquarks.

Findings

Masses below meson-baryon thresholds suggest bound states.

Possible decay channels for doubly-charm states are identified.

Results support the existence of stable doubly-heavy pentaquark molecules.

Abstract

In the present work, the doubly-charm and doubly-bottom pentaquark molecular states $D^{(*)}\Sigma_c^{(*)}$ and $B^{(*)}\Sigma_b^{(*)}$ are studied via the QCD sum rules. Sixteen color singlet-singlet type currents with the definite isospin-spin-parity $IJ^P$ are constructed to interpolate the corresponding hadronic states with the same quantum numbers. The masses and pole residues of those doubly-heavy pentaquark molecular states are calculated, the results show that their masses are all below the corresponding meson-baryon thresholds, which means that they are possible bound states, not resonant states, moreover, the possible decay channels for the doubly-charm molecular states are given.