Weak radiative decays of beauty baryons

Weak radiative decays of beauty baryons into strange baryons, induced by the electroweak penguin, are estimated by using a quark model approach. Relations between formfactors in the weak radiative decays are derived within the heavy quark effective theory. The partial decay widths are found to be of the order of 10−15 MeV for Λb → Λγ and Ξb → Ξγ and of the order of 10−13 MeV for Ωb → Ωγ. The Ωb radiative decay is thus expected at the sizable branching ratio of approximately 10−4.