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roman pasechnik

Roman Pasechnik

Senior lecturer

roman pasechnik

χc2 tensor meson transition form factors in the light front approach

Author

  • Izabela Babiarz
  • Roman Pasechnik
  • Wolfgang Schäfer
  • Antoni Szczurek

Summary, in English

We continue our work on the light-front formulation of quarkonium γγ transition form factors, extending the formalism to JPC = 2++ tensor meson states. We present an analysis of γγ → 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 γγ 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