Spin-parity assignments of excited -baryons in the Quark-Diquark Model

• Published in: Journal of physics. Conference series Vol. 1690; no. 1
• Main Authors: Ali, A, Dobrynina, A, Oleinik, E, Parkhomenko, A
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 16.12.2020
• Subjects: Baryons; P waves; Parity; Physics; Quarks
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/1690/1/012163

Recently the LHCb Collaboration have found four baryonic states called Ω b (6316), Ω b (6330), Ω b (6340), and Ω b (6350) in the \({\Xi }_{b}^{0}{K}^{-}\) invariant mass spectrum. Possible spin-parity assignments of these resonances in the Quark-Diquark Model as P-wave baryons are discussed. Parameters of the effective Hamiltonian are determined from the observed spectrum of \({\Omega }_{b}^{-}\)-baryons and compared with the ones extracted from the mass spectrum of \({\Omega }_{c}^{* }\)-baryons. Alternative interpretation, in which the three lowest-mass states have the spin-parities JP = 3/2−, 3/2−, 5/2−, predicts an \({\Omega }_{b}^{-}\)-baryon with the mass M ≃ 6304 MeV which is not yet seen experimentally.