Possible interpretation of the newly observed Ωb states

• Published in: The European physical journal. C, Particles and fields Vol. 80; no. 3
• Main Authors: Xiao, Li-Ye, Wang, Kai-Lei, Liu, Ming-Sheng, Zhong, Xian-Hui
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2020; Springer Nature B.V
• Subjects: Astronomy; Astrophysics and Cosmology; Elementary Particles; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Parity; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quark models; Regular Article - Theoretical Physics; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-020-7823-z

Inspired by the newly observed Ω b states by the LHCb Collaboration, we investigate the two-body strong decays of the low-lying λ -mode Ω b baryons up to N = 2 shell using the chiral quark model within the j - j coupling scheme. Our results indicate that: (i) the newly observed states Ω b ( 6316 ) - and Ω b ( 6330 ) - are good candidates of the light spin j = 1 states, while the spin-parity J P = 1 / 2 - and J P = 3 / 2 - cannot be distinguished. The other two states, Ω b ( 6340 ) and Ω b ( 6350 ) mostly correspond to the light spin j = 2 states, while the spin-parity J P = 3 / 2 - and J P = 5 / 2 - cannot be distinguished as well. (ii) The 2 S states with spin-parity J P = 1 / 2 + and J P = 3 / 2 + , respectively, might be narrow states with a width of Γ < 2  MeV. (iii) The 1 D states are not broad and the total decay widths vary from several to dozens of MeV, which have a good potential to be observed in future experiments.