Roman Pasechnik
Senior lecturer
The γ∗γ∗→ ηc (1S; 2S) transition form factor from quarkonium wave functions
Author
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 - Has been reorganised
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