T. Mannel et S. Recksiegel, FLAVOR-CHANGING NEUTRAL-CURRENT DECAYS OF HEAVY BARYONS - THE CASE LAMBDA(B)-]LAMBDA-GAMMA, Journal of physics. G, Nuclear and particle physics, 24(5), 1998, pp. 979-990
We investigate the rare decay Lambda(b) --> Lambda(gamma) which receiv
es both short-and long-distance contributions. We estimate the long-di
stance contributions and find them very small. The short-distance piec
e is sensitive to new physics and we discuss the sensitivity of Lambda
(b) --> Lambda(gamma) to such effects.