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 ${\mathrm{\Sigma }}_c(2455)$ and ${\mathrm{\Sigma }}_c(2520)$ and the recent CDF measurement of the strong decays of ${\mathrm{\Lambda }}_c(2595)$ and ${\mathrm{\Lambda }}_c(2625)$, we give updated coupling constants in heavy hadron chiral perturbation theory. We find $g_2=0.565_{-0.024}^{+0.011}$ for $P$-wave transitions between $s$-wave and $s$-wave baryons, and $h_2$, one of the couplings responsible for $S$-wave transitions between $s$-wave and $p$-wave baryons, is extracted from ${\mathrm{\Lambda }}_c(2595{)}^{+}\to {\mathrm{\Lambda }}_c^{+}\pi \pi$ to be $0.63\pm 0.07$. It is substantially enhanced compared to the old value of order 0.437. With the help from the quark model, two of the couplings $h_{10}$ and $h_{11}$ responsible for $D$-wave transitions between $s$-wave and $p$-wave baryons are determined from ${\mathrm{\Sigma }}_c(2880)$ decays. There is a tension for the coupling $h_2$ as its value extracted from ${\mathrm{\Lambda }}_c(2595{)}^{+}\to {\mathrm{\Lambda }}_c^{+}\pi \pi$ will imply ${\mathrm{\Xi }}_c(2790{)}^0\to {\mathrm{\Xi }}_c^{\prime }\pi$ and ${\mathrm{\Xi }}_c(2815{)}^{+}\to {\mathrm{\Xi }}_c^{*}\pi$ rates slightly above the current limits. It is conceivable that SU(3) flavor symmetry breaking can help account for the discrepancy.

• Received 25 August 2015

DOI:https://doi.org/10.1103/PhysRevD.92.074014