Strong decays of exotic and non-exotic heavy baryons in the chiral quark-soliton model

TL;DR

This paper uses the chiral quark-soliton model in the large N_c limit to relate heavy and light baryon properties, accurately predicting strong decay widths, including narrow widths of exotic heavy baryons consistent with LHCb data.

Contribution

It provides a parameter-free prediction of exotic anti-decapentaplet baryon widths using a universal mean field approach, linking heavy and light baryon decay properties.

Findings

Accurately describes strong decays of charm and bottom sextets.

Predicts very narrow widths for exotic anti-decapentaplet baryons.

Explains the small observed widths of $ ext{Ω}_c(3050)$ and $ ext{Ω}_c(3119)$.

Abstract

In the large $N_c$ limit both heavy and light baryons are described by the universal mean field, which allows us to relate the properties of heavy baryons to light ones. With the only input from the decays of light octet baryons (due to the universality of the chiral mean field), excellent description of strong decays of both charm and bottom sextets is obtained. The parameter-free prediction for the widths of exotic anti-decapentaplet ($\overline{\boldsymbol{15}}$) baryons is also made. The exotic heavy baryons should be anomalously narrow despite of large phase space available. In particular, the widths of $\Omega_c(3050)$ and $\Omega_c(3119)$, interpreted as members of $\overline{\boldsymbol{15}}$-plet, are very small: 0.48~MeV and 1.12~MeV respectivly. This result is in very good agreement with the measurements of the LHCb Collaboration and provides natural and parameter free explanation of the LHCb observation that $\Omega_c(3050)$ and $\Omega_c(3119)$ have anomalously small widths among five recently observed states.