Isospin violating decays of vector charmonia

• Published in: The European physical journal. C, Particles and fields Vol. 83; no. 10; pp. 973 - 7
• Main Authors: Geng, Chao-Qiang, Liu, Chia-Wei, Zhang, Jiabao
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2023; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Astronomy; Astrophysics and Cosmology; Collaboration; Elementary Particles; Evaluation; Form factors; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quarks; Regular Article - Theoretical Physics; String Theory; Symmetry; Theoretical physics
• ISSN: 1434-6052; 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-023-12099-1

We study the isospin violating decays of vector charmonia to Λ Σ ¯ 0 and its charge conjugate. They are dominated by the single photon annihilation and can be evaluated reliably with timelike form factors. We utilize the quark-pair creation model, which is valid for the OZI suppressed decays, to evaluate the form factors. We obtain the branching fractions of B ( J / ψ → Λ Σ ¯ 0 + c . c . ) = ( 2.4 ± 0.4 ) × 10 - 5 and B ( ψ ( 2 S ) → Λ Σ ¯ 0 + c . c . ) = ( 3.0 ± 0.5 ) × 10 - 6 , which are compatible with the measurements by the BESIII collaborations, respectively. The decay asymmetries are found to be α J / ψ = 0.314 and α ψ ( 2 S ) = 0.461 , which can be examined at BESIII in the foreseeable future.