Abstract
Transition decay widths by one-pion emissions for excited heavy baryons with a single heavy (charm and bottom) quark are investigated by following the heavy-quark symmetry and its breaking effects at $\mathcal{O}(1/M)$ for a heavy-baryon mass $M$. Based on heavy-baryon effective theory, interaction Lagrangians for the heavy baryons with an axial-vector current induced by a pion are constructed. We show that the transition decay widths in several channels are related up to $\mathcal{O}(1/M)$. The results will be useful in the experimental study of excited heavy baryons.
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