Strong decays of charmed baryons in heavy hadron chiral perturbation theory: An update

This is the authors' abstract. We don't add key points for this paper.

We first give a brief overview of the charmed baryon spectroscopy and discuss their possible structure and spin-parity assignments in the quark model. With the new Belle measurement of the widths of Σc(2455) and Σc(2520) and the recent CDF measurement of the strong decays of Λc(2595) and Λc(2625), we give updated coupling constants in heavy hadron chiral perturbation theory. We find g₂=0.565_-0.024+0.011 for P-wave transitions between s-wave and s-wave baryons, and h₂, one of the couplings responsible for S-wave transitions between s-wave and p-wave baryons, is extracted from Λc(2595)⁺→Λc⁺ππ to be 0.63±0.07. It is substantially enhanced compared to the old value of order 0.437. With the help from the quark model, two of the couplings h₁₀ and h₁₁ responsible for D-wave transitions between s-wave and p-wave baryons are determined from Σc(2880) decays. There is a tension for the coupling h₂ as its value extracted from Λc(2595)⁺→Λc⁺ππ will imply Ξc(2790)⁰→Ξc^'π and Ξc(2815)⁺→Ξc*π rates slightly above the current limits. It is conceivable that SU(3) flavor symmetry breaking can help account for the discrepancy.