Strong decays of singly heavy baryons

Abstract

More and more excited baryons have been reported experimentally, but many properties are still unclear. This work attempts to simultaneously study the masses and strong decay widths of some singly heavy baryons, in order to provide possible quantum numbers for these states. The chiral quark model and the ${}^3{P}_0$ decay model are employed to calculate the masses and decay widths of ${\Lambda }_{c(b)}$ and ${\Sigma }_{c(b)}$ baryons for all quantum numbers with $2S$, $1P$, and $2P$ waves. We considered not only two-body strong decays but also the influence of three-body decays. Our calculations show that: (i) For states with experimentally determined quantum numbers, such as ${\Lambda }_c(2595)$, ${\Lambda }_c(2625)$, ${\Lambda }_b(5912)$ and ${\Lambda }_b(5920)$, the results are consistent with experimental data and the conclusions of most theoretical studies. (ii) For states whose quantum numbers have not yet been fully determined experimentally, we provide possible interpretations. For example, our calculations tend to interpret ${\Lambda }_c(2910)$ is interpreted as a $J^P={\frac{3}{2}}^{-}$ state with 1P-wave $\rho$-mode or a $J^P={\frac{1}{2}}^{-}$ state with 2P wave $\lambda$-mode. ${\Lambda }_c(2940)$ can be interpreted as the $J^P={\frac{3}{2}}^{-}$ state with 2P-wave $\lambda$-mode. For ${\Lambda }_c(2860)$, we offer a different interpretation, proposing that its mass and width closely match those of a 2P-wave $J^P={\frac{1}{2}}^{-}$ state. It is hoped that our calculations can provide valuable information for the experimental and theoretical studies of heavy baryons.

Comments: 13 pages, 3 figures