Holographic charm and bottom pentaquarks II: Open and hidden decay widths

TL;DR

This paper studies the decay modes of non-strange charm and bottom pentaquarks predicted by holographic QCD, showing that open charm and bottom decay channels dominate and align with recent LHCb observations.

Contribution

It provides a holographic QCD-based analysis of pentaquark decay widths, including predictions for bottom pentaquarks and the impact of spin interactions on their stability.

Findings

Open charm and bottom decay modes dominate over hidden ones.

Predicted decay widths are consistent with LHCb data.

Degeneracy is lifted by spin interactions, enabling decay.

Abstract

We analyze the decay modes of the three $[\frac 12\frac 12^-]_{S=0,1}$ and $[\frac 12\frac 32^-]_{S=1}$ non-strange pentaquarks with hidden charm and bottom, predicted by holographic QCD in the heavy quark limit. In leading order, the pentaquarks %are composed of heavy-light mesons in bulk bound to an instanton core. They are degenerate and stable by heavy quark symmetry. At next to leading order, the spin interactions lift the degeneracy and cause the pentaquarks to decay. We show that the open charm (bottom) decay modes dwarf the hidden charm (bottom) ones, with total widths that are consistent with those recently reported by LHCb for charm pentaquarks. Predictions for bottom pentaquarks are given.