Shedding light on charmonium

Journal Article · 29 February 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.L031902 · OSTI ID:2316072

Wang, Zhiguo ; Li, Meijian ; Li, Yang ; Vary, James P.

We investigate E1 radiative transitions within charmonium in a relativistic approach based on light-front QCD. In quantum field theory, two sets of processes are pure E1: ${\chi }_{c0}\to J/\psi \gamma$ ( $\psi \to {\chi }_{c0}\gamma$ ) and $h_c\to {\eta }_c\gamma$ ( ${\eta }_c^{\prime }\to h_c\gamma$ ), both involving the $P$ -wave charmonia. We compute the E1 radiative decay widths as well as the corresponding transition form factors of various processes including those involving $2P$ states. These observables provide an access to the microscopic structures of the $P$ -wave charmonium. We show that our parameter-free predictions are in excellent agreement with the experimental measurements as well as lattice simulations whenever available. Published by the American Physical Society 2024

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0023692
• OSTI ID: 2316072
• Journal Information: Physical Review. D., Journal Name: Physical Review. D. Vol. 109 Journal Issue: 3; ISSN 2470-0010
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English