Identification of the newly observed Σ_b(6097)^± baryons from their strong decays

2018/10/16 by Pei Yang, Jing-Jing Guo, Ailin Zhang · 1 citation
Physics and Astronomy · #hep-ph #hep-ex

paper · pdf · doi:10.1103/physrevd.99.034018

published as Phys. Rev. D 99, 034018 (2019) · 5 pages, 6 tables, RevTex

arxiv created 2018/10/16 · arxiv updated 2019/02/27

Abstract

Two bottom Σ_b(6097)^± baryons were observed in the final states Λ_b⁰π^- and Λ_b⁰π⁺ in pp collision by LHCb collaboration, whose masses and widths were measured. In a ³P₀ model, the strong decay widths of two ground S-wave and seven excited P-wave Σ_b baryons have been systematically computed. Numerical results indicate that the newly observed Σ_b(6097)^± are very possibly Σ_b2¹(3\over 2^-) with J^P=3\over 2^- or Σ_b2¹(5\over 2^-) with J^P=5\over 2^-. The predicted decay widths of Σ_b(6097)^± are consistent with experimental measurement from LHCb. In particular, it may be possible to distinguish these two assignments through ratios Γ(Σ_b(6097)^±→ Σ_b^±π⁰)/Γ(Σ_b(6097)^±→ Σ_b^*±π⁰), which can be measured by experiments in the future. In the meantime, our results support the assignments that Σ_b^± and Σ_b^*± are the ground S-wave Σ_b baryons with J^P=1\over 2⁺ and J^P=3\over 2⁺, respectively.

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