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Roman Pasechnik

Senior lecturer

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The γ∗γ∗→ ηc (1S; 2S) transition form factor from quarkonium wave functions

Author

  • Izabela Babiarz
  • Victor P. Goncalves
  • Roman Pasechnik
  • Wolfgang Schä Fer
  • Antoni Szczurek

Editor

  • Gennaro Corcella
  • Erika De Lucia
  • Pasquale Di Nezza
  • Paola Gianotti
  • Giulia Pancheri

Summary, in English

We discuss γ ∗γ ∗→ ηc(1S) ; ηc (2S) transition form factor for both virtual photons. The general formula is given. We use difierent models for the cc̄ wave function obtained from the solution of the Schrödinger equation for diffierent cc̄ potentials: harmonic oscillator, Cornell, logarithmic, power-law, Coulomb and Buchmüller{Tye. We showed some examples of wave functions in the Light Front representation as well as in the rest frame of cc̄. We compare our results to the BaBar experimental data for ηc(1S), with one real and one virtual photon, and to the values collected by the Particle Data Group for the form factor F(0; 0), decay width τγ γ and decay constant fηc . We also consider the non-relativistic limit for F(0; 0) with the wave function evaluated at the origin R(0).

Department/s

  • Theoretical Particle Physics

Publishing year

2019

Language

English

Pages

95-100

Publication/Series

Frascati Physics Series

Volume

69

Document type

Conference paper

Publisher

Istituto Nazionale di Fisica Nucleare

Topic

  • Mathematical Analysis

Conference name

2019 International Conference on the Structure and the Interactions of the Photon, PHOTON 2019, Satellite Workshop on Photon Physics and Simulation at Hadron Colliders

Conference date

2019-06-03 - 2019-06-07

Conference place

Frascati, Italy

Status

Published

ISBN/ISSN/Other

  • ISSN: 1122-5157
  • ISBN: 9788886409704