Comprehensive study of hidden charm pentaquarks with an improved unitarization method

TL;DR

This paper models hidden-charm pentaquark resonances through meson-baryon interactions using an improved unitarization method, successfully reproducing known states and predicting new ones.

Contribution

It introduces a novel hybrid loop function scheme to improve unitarization, eliminating unphysical poles while maintaining accurate physical state predictions.

Findings

Reproduces six experimentally known hidden-charm pentaquarks.

Predicts new states in the S=-1, I=1 sector.

Proposes an improved unitarization method with a hybrid loop function.

Abstract

This work investigates dynamically generated hidden-charm baryon resonances arising from meson-baryon interactions. Using the local hidden gauge formalism, we model the interaction via t-channel vector meson exchange and unitarize the amplitude using the Bethe-Salpeter equation. To address regularization issues, we propose a novel ``hybrid loop function'' scheme that eliminates the unphysical poles -- common artifacts in cutoff or dimensional regularization -- while keeping the predictions of physical states. Consequently, the model successfully reproduces six experimentally known hidden-charm pentaquarks as well as earlier theoretical results, and predicts new states in the S=-1, I=1 sector.