One – pion transitions between heavy baryons in the constituent quark model

Single pion transitions of S wave to S wave, P wave to S wave and P wave to P wave heavy baryons are analyzed in the framework of the Heavy Quark Symmetry limit (HQS). We then use a constituent quark model picture for the light diquark system with an underlying SU(2Nf ) ⊗ O(3) symmetry to reduce the number of the HQS coupling factors required to describe these transitions. A single constituent quark model p-wave coupling is necessary to describe transitions among the S wave ground states. One s-wave and one d-wave coupling factors are required to determine each of the transitions from the orbitally symmetric K-multiplet and from the orbitally antisymmetric k-multiplet down to the ground state. P wave to P wave single pion transitions are described by altogether eight constituent quark model coupling constants. We also estimate decay rates of some single pion transitions between charm baryon states.