Rare radiative $\Xi^{-}_{b}\to \Xi^-\gamma$ decay in the relativistic quark model

TL;DR

This paper calculates the branching ratio of the rare radiative decay of the $\\Xi_b^-$ baryon using a relativistic quark model, finding results consistent with experimental limits and other theoretical approaches.

Contribution

It provides a detailed calculation of decay form factors in a relativistic framework, improving understanding of rare baryon decays within QCD.

Findings

Branching ratio below LHCb upper limit

Results align with SU(3) symmetry and other models

Relativistic effects significantly influence decay form factors

Abstract

Recently the LHCb collaboration put the upper limit on the $\Xi^{-}_{b} \rightarrow \Xi^{-}\gamma$ decay branching ratio $Br(\Xi^{-}_{b} \rightarrow \Xi^{-}\gamma)< 1.3\times 10^{-4}$. The measured value is below the light-cone sum rule prediction. In this paper the rare radiative decay of the $\Xi^{-}_{b}$ baryon is studied in the framework of the relativistic quark model based on the quasipotential approach and QCD. The decay form factors are calculated with the comprehensive account of the relativistic effects. The obtained result for the branching ratio is found to be below the upper limit set by LHCb and is consistent with theoretical predictions based on the SU(3) flavor-symmetry, light-front quark model and light-cone QCD sum rules in full theory within theoretical uncertainties.