@inproceedings{9233994522e04f138a44c8c15cf7382f,
title = "The γ∗γ∗→ ηc (1S; 2S) transition form factor from quarkonium wave functions",
abstract = "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 c{\=c} wave function obtained from the solution of the Schr{\"o}dinger equation for diffierent c{\=c} potentials: harmonic oscillator, Cornell, logarithmic, power-law, Coulomb and Buchm{\"u}ller{Tye. We showed some examples of wave functions in the Light Front representation as well as in the rest frame of c{\=c}. 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).",
author = "Izabela Babiarz and Goncalves, {Victor P.} and Roman Pasechnik and {Sch{\"a} Fer}, Wolfgang and Antoni Szczurek",
year = "2019",
language = "English",
series = "Frascati Physics Series",
publisher = "Istituto Nazionale di Fisica Nucleare",
pages = "95--100",
editor = "Gennaro Corcella and {De Lucia}, Erika and {Di Nezza}, Pasquale and Paola Gianotti and Giulia Pancheri",
booktitle = "PHOTON 2019 - International Conference on the Structure and the Interactions of the Photon",
note = "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: 03-06-2019 Through 07-06-2019",
}