Structure of charmed baryons studied by pionic decays

Nagahiro, Hideko*; Yasui, Shigehiro*; Hosaka, Atsushi; Oka, Makoto   ; Noumi, Hiroyuki*; Noumi, Hiroyuki*

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, , , , and , as well as for the ground states and . The calculated decay widths are in good agreement with the experimental data, and several important predictions for higher excited baryons are given. We also 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 baryons. We emphasize the importance of the branching ratios of for the study of the nature of higher excited baryons.