Regular Article - Theoretical Physics
Department of Physics, Jahrom University, P.O. Box 74137-66171, Jahrom, Iran
2 Department of Physics, University of Tehran, North Karegar Avenue, 14395-547, Tehran, Iran
3 Department of Physics, Doǧuş University, Dudullu-Ümraniye, 34775, Istanbul, Turkey
Accepted: 13 January 2022
Published online: 24 January 2022
Recently, the LHCb Collaboration performed first search for the rare radiative decay and put an upper limit, , on its branching ratio. The measurement agrees well with existing theory prediction using SU(3) flavor symmetry method, but shows a slight tension with the previous prediction from light-cone sum rules. Inspired by this, we investigate this decay as well as other radiative decays of to and baryons using the form factors calculated from light-cone QCD sum rules in full theory. we obtain , which lies below the upper limit set by LHCb and is consistent with flavor-symmetry driven prediction. Our predictions on other channels may be checked in experiment and by other phenomenological approaches.
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