Roman Pasechnik
Senior lecturer
χc2 tensor meson transition form factors in the light front approach
Author
Summary, in English
We continue our work on the light-front formulation of quarkonium γ∗γ transition form factors, extending the formalism to JPC = 2++ tensor meson states. We present an analysis of γ∗γ → χc2 transition amplitude and the pertinent helicity form factors. Our relativistic formalism is based on the light-front quark-antiquark wave function of the quarkonium. We calculate the two-photon decay width as well as three independent γ∗γ transition form factors for Jz = 0, 1, 2 as a function of photon virtuality Q2. We compare our results for the two-photon decay width to the recently measured ones by the Belle and BES III collaborations. Even when including relativistic corrections, a very small Γ(λ = 0)/Γ(λ = 2) ~ 10−3 ratio is found which is beyond present experimental precision. We also present the form factors as a function of photon virtuality and compare them to the sparse experimental data on the so-called off-shell width. The formalism presented here can be used for other 2++ mesons, excited charmonia or bottomonia or even light qq¯-mesons.
Department/s
- Particle and nuclear physics
Publishing year
2024-06
Language
English
Publication/Series
Journal of High Energy Physics
Volume
2024
Issue
6
Document type
Journal article
Publisher
Springer
Topic
- Atom and Molecular Physics and Optics
Keywords
- Properties of Hadrons
- Quarkonium
Status
Published
ISBN/ISSN/Other
- ISSN: 1029-8479