It is shown that, in the bound state picture, the Λc(2593)→Λcγ and Λc(2625)→Λcγ decays are severely suppressed. On the other hand, for their bottom counterparts, which are predicted to have masses 5900 and 5926 MeV respectively, may have significant radiative branching ratio. In particular, the Λb(5926)→Λbγ mode may even dominate over the strong decay mode. The isospin allowed ΛQ∗∗→ΣQγ mode is expected to be small.
@article{arxiv.hep-ph/9510421,
title = {Radiative Decays of Excited $\Lambda_Q$ Baryons in the Bound State Picture},
author = {Chi-Keung Chow},
journal= {arXiv preprint arXiv:hep-ph/9510421},
year = {2008}
}