Journal Article

Molecular states from B¯(∗)N interactions

Chen, Qi-Hui, Huang, Yin, Zhu, Hong Qiang, Jian, Zhong-Yi, He, Jun

2023

Overview

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 0 π + 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 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 ¯ ∗ N channel, the possible B ¯ N - 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 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 B ¯ N molecular state with spin parity J P = 3 / 2 + or a B ¯ N - B ¯ ∗ N bound state. However, assignment of Λ b ( 6152 ) as an F -wave B ¯ N molecular is disfavored. The Λ b ( 6152 ) can be explained as meson–baryon molecular state with a small B ¯ N component. The calculation also predict the existence of two B ¯ N - B ¯ ∗ N bound states with J P = 1 / 2 - and J P = 3 / 2 - .

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Baryons / Collaboration / Hadrons / Heavy Ions / Nuclear Fusion / Nuclear Physics / P waves / Particle and Nuclear Physics / Physics / Physics and Astronomy / Quantum numbers / Quarks / Regular Article - Theoretical Physics / Rho-mesons / Schrodinger equation