Odd-parity dynamically generated baryon resonances with beauty flavor

TL;DR

This paper models heavy-flavor baryon resonances as dynamically generated states from baryon-meson interactions, successfully reproducing known  baryons and predicting new resonances within a heavy-quark spin symmetry framework.

Contribution

It introduces a unitary coupled-channel model incorporating heavy-quark spin symmetry to study and predict baryon resonances with beauty flavor, extending the Weinberg-Tomozawa Lagrangian.

Findings

Reproduces (5912) and (5920) baryons observed by LHCb.

Identifies these states as heavy-quark spin partners.

Predicts new  resonances within the same symmetry multiplets.

Abstract

We study baryon resonances with heavy flavor in a molecular approach, thus as dynamically generated by baryon-meson scattering. This is accomplished by using a unitary coupled-channel model taking, as bare interaction, the extension of the Weinberg-Tomozawa SU(3) Lagrangian. A special attention is payed to the inclusion of heavy-quark spin symmetry and to the study of the generated baryon resonances that complete the heavy-quark spin multiplets. Our model reproduces the \Lambda_b(5912) and \Lambda_b(5920) baryons, which were recently observed by the LHCb collaboration. According to our analysis, these two states are heavy-quark spin symmetric partners. We also make predictions for few \Xi_b baryon resonances, which belong to the same SU(3)xHQSS multiplets as the \Lambda_b particles.