Rare radiative Ξb- → Ξ- γ decay in the relativistic quark model

Recently, the LHCb collaboration put the upper limit on the Xi b(-) -> Xi(-) gamma decay branching ratio Br(Xi(-)(b) -> Xi(-) gamma) < 1.3 x 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.

Automated summary

This paper studies the rare radiative decay of the Xi(-)(b) baryon and finds that the branching ratio is below the upper limit set by LHCb, consistent with theoretical predictions.