WEAK RADIATIVE DECAY WIDTH OF Λ_b→Λγ DECAY

We have systematically analyzed the two-body weak radiative Λ_b→Λγ decay of bottom baryon. The weak radiative decay proceeds through W-exchange accompanied by a photon emission. Effective Lagrangian has been used for the W-exchange bremsstrahlung processes to estimate the long distance effect through pole. The short distance effect at the quark level (b→sγ) is also estimated here. With these predictions we have finally obtained the branching ratio of Λ_b→Λγ as Br(Λ_b→Λγ)=2.3×10^-10 which is in close agreement with the experimental results.