Studies of the Reaction e+e−→ e+e−χci(→ γJ∕ψ(→ μ+μ−)) at Belle II with the Monte Carlo Generator EKHARA

Abstract

The Belle II experiment with the integrated luminosity of 50 ab 1 will allow for an access to information never available before. In this paper, we concentrate on studies of the chi(ci)-gamma*-gamma* form factors using the Monte Carlo event generator EKHARA. The precise experimental knowledge of the form factors can differentiate between various models giving predictions for the electronic widths Gamma(chi(c1, 2) -> e(+)e(-)), even without direct measurements of these widths.