2017/04/30 by Wei Wang, Ruilin Zhu, Rui-Lin Zhu · 1 citation
Physics and Astronomy · #Baryon #Charmed baryons #Diquark #Excited state #High-Energy Particle Collisions Research #Nuclear physics #Omega #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.96.014024
published as Phys. Rev. D 96, 014024 (2017) · 6 pages and 2 tables; To be published in Phys.Rev.D
openalex created_date 2017/04/14 · arxiv created 2017/07/06 · openalex publication_date 2017/07/25 · arxiv updated 2017/08/02 · openalex updated_date 2026/08/05
We study the charmed and bottomed doubly strange baryons within the heavy-quark-light-diquark framework. The two strange quarks are assumed to lie in S wave and thus their total spin is 1. We calculate the mass spectra of the S- and P-wave orbitally excited states and find the \mathrm\ensuremathΩc0(2695) and \mathrm\ensuremathΩc0(2770) fit well as the S-wave states of charmed doubly strange baryons. The five newly \mathrm\ensuremathΩc0(X) resonances observed by the LHCb Collaboration, i.e., \mathrm\ensuremathΩc0(3000), \mathrm\ensuremathΩc0(3050), \mathrm\ensuremathΩc0(3066), \mathrm\ensuremathΩc0(3090), and \mathrm\ensuremathΩc0(3119), can be interpreted as the P-wave orbitally excited states. In heavy quark effective theory, we analyze their decays into the \mathrm\ensuremathΞc+K^\ensuremath- and \mathrm\ensuremathΞc^\ensuremath'+K^\ensuremath-, and point out that decays of the five P-wave \mathrm\ensuremathΩc0 states into the \mathrm\ensuremathΞc+K^\ensuremath- and \mathrm\ensuremathΞc^\ensuremath'+K^\ensuremath- are suppressed by either heavy quark symmetry or phase space. The narrowness of the five newly observed \mathrm\ensuremathΩc0(X) states can then be naturally interpreted with heavy quark symmetry.