Weak radiative decay width of Λb→Λγ decay

We have systematically analyzed the two-body weak radiative Lambda (b) --> Lambda gamma 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 --> s gamma) is also estimated here. With these predictions we have finally obtained the branching ratio of Lambda (b) --> Lambda gamma as Br(Lambda (b) --> Lambda gamma) = 2.3 x 10(-10) which is in close agreement with the experimental results.