Molecular states from $\bar{B}^{(*)}N$ interactions

In 2019, two new structures $Λ_b(6146)$ and $Λ_b(6152)$ were observed by the LHCb Collaboration at the invariant mass spectrum of $Λ_b^0π^{+}π^{-}$, which aroused a hot discussion about their inner structures. The $Λ_b(6146)$ and $Λ_b(6152)$ might still be molecular states because their masses are close to threshold of a $\bar{B}$ meson and a nucleon. In this work, we perform a systematical investigation of possible heavy baryonic molecular states from the $\bar{B}N$ interaction. Since the $\bar{B}N$ channel strongly couples to the $\bar{B}^{*}N$ channel, the possible $\bar{B}N-\bar{B}^{*}N$ bound states are also studied. The interaction of the system considered is described by the $t$-channel $σ$, $π$, $η$ ,$ω$, and $ρ$ mesons exchanges. By solving the non-relativistic Schrödinger equation with the obtained one-boson-exchange potentials, the $\bar{B}^{(*)}N$ bound states with different quantum numbers are searched. The calculation suggests that recently observed $Λ_b(6146)$ can be assigned as a $P$-wave $\bar{B}N$ molecular state with spin parity $J^P=3/2^{+}$ or a $\bar{B}N-\bar{B}^{*}N$ bound state. However, assignment of $Λ_b(6152)$ as an $F$-wave $\bar{B}N$ molecular is disfavored. The $Λ_b(6152)$ can be explained as meson-baryon molecular state with a small $\bar{B}N$ component. The calculation also predict the existence of two $S$-wave $\bar{B}N-\bar{B}^{*}N$ bound states that can be related to the experimentally observed $Λ_b(5912)$ and $Λ_b(5920)$.

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