Molecular states from B($)over-bar ^(*) N interactions

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