Unified spectroscopic study of bottom mesons and doubly bottom baryons using a relativistic flux-tube model

Abstract

Using the relativistic flux tube model with spin-dependent corrections, we present a unified investigation of the mass spectra for singly bottom mesons (B, Bs) and doubly bottom baryons (Ξbb, Ωbb). Within this framework, the calculated masses for established B and Bs meson states show excellent agreement with experimental data. Leveraging these reliable predictions for low-lying states, we propose spectroscopic assignments for several higher excitations: we identify the BJ*(5732) resonance as an excellent candidate for the 1P(1+) state; further, we assign the BJ(5840) resonance as the first radial excitation (2S), and the BJ(5970) resonance as a 1D-wave orbital excitation. In the bottom-strange sector, we predict that the recently observed BsJ(6063) and BsJ(6114) resonances belong to the 1D-wave multiplet. Extending our model to doubly bottom baryons, we present comprehensive predictions for the spectra of the Ξbb and Ωbb baryons, identifying their ground and excited states. These theoretical insights serve as valuable benchmarks, offering guidance for future experimental searches targeting yet-to-be-discovered bottom mesons and doubly bottom baryons.