Structure of charmed baryons studied by pionic decays

TL;DR

This paper analyzes the decay patterns of charmed baryons using the quark model and heavy quark symmetry, providing explanations for known states and predictions for higher excited states.

Contribution

It offers a systematic study of charmed baryon decays via one pion emission, emphasizing the role of axial-vector coupling and chiral symmetry, with new predictions for higher excited states.

Findings

Decay widths of known excited states are well explained.

Axial-vector coupling is essential for accurate decay width predictions.

Branching ratios are crucial for understanding higher excited baryons.

Abstract

We investigate the decays of the charmed baryons aiming at the systematic understanding of hadron internal structures based on the quark model by paying attention to heavy quark symmetry. We evaluate the decay widths from the one pion emission for the known excited states, \Lambda_c^*(2595), \Lambda_c^*(2625), \Lambda_c^*(2765), \Lambda_c^*(2880) and \Lambda_c^*(2940), as well as for the ground states \Sigma_c(2455) and \Sigma_c^*(2520). The decay properties of the lower excited charmed baryons are well explained, and several important predictions for higher excited baryons are given. We find that the axial-vector type coupling of the pion to the light quarks is essential, which is expected from chiral symmetry, to reproduce the decay widths especially of the low lying \Lambda_c^* baryons. We emphasize the importance of the branching ratios of \Gamma(\Sigma_c^*\pi)/\Gamma(\Sigma_c\pi) for the study of the nature of higher excited \Lambda_c^* baryons.