The strong decays of the low-lying $ρ$-mode $1P$-wave singly heavy baryons

We have systematically calculated the strong decays of the low-lying $ρ$-mode $1P$-wave $Λ_{c(b)}$, $Σ_{c(b)}$, $Ξ_{c(b)}$, $Ξ^{'}_{c(b)}$, $Ω_{c(b)}$ baryons using the chiral quark model within the $j$-$j$ coupling scheme. For the controversial states, our results indicate: (i) For the singly charmed heavy baryons, the newly observed $Λ_{c}(2910)^+$ is a good candidate of the $J^P=5/2^-$ state $Λ_c|J^{P}=\frac{5}{2}^{-},2\rangle_ρ$. (ii) For the singly bottom heavy baryons, the $Ξ_{b}(6227)^-$ favors the $J^{P}=5/2^{-}$ state $Ξ_{b}|J^{P}=\frac{5}{2}^{-},2\rangle_ρ$. (iii) The other missing $ρ$-mode $1P$-wave excitations in $Λ_{b}$, $Σ_{c(b)}$ and $Ξ^{'}_{c(b)}$ families appear to be broad structures with $Γ$$\sim$(100-200) MeV, and their strong decay widths are sensitive to their masses. (iv) The $ρ$-mode $1P$-wave $Ξ_{c(b)}$ and $Ω_{c(b)}$ baryons have a relatively narrow decay width of a few MeV or a few tens of MeV, and have a good potential to be observed in forthcoming experiments.

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