Magnetic transitions and radiative decays of singly heavy baryons

TL;DR

This paper uses a pion mean-field approach to study the properties and radiative decay rates of singly heavy baryons, treating light and heavy baryons within a unified framework based on large N_c limit.

Contribution

It introduces a unified pion mean-field model for light and singly heavy baryons, calculating transition magnetic moments and decay rates without extra parameters.

Findings

Transition magnetic moments are determined without additional parameters.

Radiative decay rates are computed assuming small E2 moments.

Results are compared with other theoretical approaches.

Abstract

A pion mean-field approach allows one to investigate light and singly heavy baryons on an equal footing. In the large $N_c$ limit, the light and singly heavy baryons are viewed respectively as $N_c$ and $N_c-1$ valence quarks bound by the pion mean fields created self-consistently, since a heavy quark can be regarded as a static color source in the limit of the infinitely heavy quark mass. The transition magnetic moments of the baryon sextet are determined entirely by using the parameters fixed in the light-baryon sector without any additional parameters introduced. Assuming that the transition $E2$ moments are small, we are able to compute the radiative decay rates of the baryon sextet. The numerical results are discussed, being compared with those from other approaches.