2020/02/29 by Qiang Mao, Hua-Xing Chen, Hui-Min Yang · 8 citations
Physics and Astronomy · #Baryon #Heavy quark effective theory #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum number #Quark #Quark model #Strangeness #hep-ex #hep-lat #hep-ph
paper · pdf · doi:10.3390/universe6060086
published in Universe 6(6), 86 (Multidisciplinary Digital Publishing Institute) · 14 pages, 6 figures, 1 table, revised version
openalex created_date 2020/03/06 · openalex publication_date 2020/06/23 · arxiv created 2020/07/08 · arxiv updated 2020/07/09 · openalex updated_date 2026/08/05
We study the Λ b ( 6146 ) 0 and Λ b ( 6152 ) 0 recently observed by LHCb using the method of Quantum Chromodynamics (QCD) sum rules within the framework of heavy quark effective theory. Our results suggest that they can be interpreted as D-wave bottom baryons of J P = 3 / 2 + and 5 / 2 + respectively, both of which contain two λ -mode excitations. We also investigate other possible assignments containing ρ -mode excitations. We extract all the parameters that are necessary to study their decay properties when using the method of light-cone sum rules. We predict masses of their strangeness partners to be m Ξ b ( 3 / 2 + ) = 6.26 − 0.14 + 0.11 GeV and m Ξ b ( 5 / 2 + ) = 6.26 − 0.14 + 0.11 GeV with the mass splitting Δ M = m Ξ b ( 5 / 2 + ) − m Ξ b ( 3 / 2 + ) = 4.5 − 1.5 + 1.9 MeV, and propose to search for them in future CMS, EIC, and LHCb experiments.