Radiative return via electron pair production : Monte Carlo simulation of the process e+ e- ---> pi+ pi- e+ e

Abstract

Contributions from the reaction e+e− ! + −e+e− to the pion form factor measurement via radiative return method are discussed basing on the results of a Monte Carlo generator (EKHARA). The generator contains contributions from the initial and final state emission of a e+e− pair from e+e− ! + − production diagrams and the + − pair production from space-like and time-like Bhabha diagrams. A detailed study is performed for the factory energy. Tests of the generation procedure are also presented.