TTP03-30 e+e- -> pi+pi-e+e-: a potential background for sigma(e+e- ->pi+pi-) measurement via radiative return method

pi+pi-e+e-: a potential background for sigma(e+e- →pi+pi-) measurement via radiative return method > A Monte Carlo generator (EKHARA) has been constructed to simulate the reaction e+e- → pi+pi-e+e- based on initial and final state emission of a e+e- pair from e+e- → pi+pi- production diagram. A detailed study of the process, as a potential background for sigma(e+e- → pi+pi-) measurement via radiative return method, is presented for phi- and B- factory energies.