One-photon transitions between heavy baryons in a relativistic three-quarkmodel

We study one-photon transitions between heavy baryon states in the framewor k of a relativistic three-quark model. We calculate the one-photon transiti on rates for ground-state to ground-state transitions and for some specific excited state to ground-state transitions. Our rate predictions for the mo st important transitions are: Gamma(Sigma(c)(+) --> Lambda(+)(c)gamma)= 60. 7 +/- 1.5 keV, Gamma(Xi'(+)(c) --> Xi(c)(+)gamma) = 12.7 +/- 1.5 keV, Gamma (Lambda(cl)(2593) --> Lambda(c)(+)gamma) = 104.3 +/- 1.3 keV. (C) 1999 Publ ished by Elsevier Science B.V. All rights reserved. PACS: 12.39.Ki; 14.20.L q; 14.20.Mr.