Charmed baryon resonances with heavy-quark spin symmetry

TL;DR

This paper models charmed baryon resonances using a unitary coupled-channel approach that respects heavy-quark spin symmetry, predicting states that align with some experimental findings and suggesting further data and model refinement are needed.

Contribution

It extends the SU(3) chiral Lagrangian to SU(8) spin-flavor symmetry incorporating heavy-quark spin symmetry to dynamically generate charmed baryon resonances.

Findings

Some generated states match experimental resonances.

The model predicts additional states requiring further data.

The approach provides a unified framework for understanding charmed baryons.

Abstract

Charmed baryon resonances that are generated dynamically are studied within a unitary baryon-meson coupled-channel model, which incorporates heavy-quark spin symmetry. The extension of the SU(3) Weinberg-Tomozawa chiral Lagrangian to SU(8) spin-flavor symmetry plus a suitable symmetry breaking is used. The model produces resonances with negative parity from s-wave interaction of pseudoscalar and vector mesons with $1/2^+$ and $3/2^+$ baryons. Some of our dynamically generated states can be readily assigned to resonances found experimentally, while others do not have a straightforward identification and require the compilation of more data and also refinements of the model.