Radiative Return: a progress on FSR tests

Abstract

To improve the accuracy of the e+e- -> pi+pi-gamma Radiative Return method, one has to control the theoretical uncertainty of the final-state photon emission. It is of particular importance at DAPHNE for the analysis, where cuts are relaxed to cover the threshold region. By means of Monte Carlo generator PHOKHARA we compare several final-state radiation models and present results, relevant for a meson factory running at sqrt{s}=1 GeV.

9 pages, 5 figures, Acta Physica Polonica B style, Based on the talks given at Topical workshop: Low energy constraints on extensions of the Standard Model, 23-27 July 2009, Kazimierz, Poland and XXXIII International Conference of Theoretical Physics Matter To The Deepest: Recent Developments in Physics of Fundamental Interactions, 11-16 September 2009, Ustron, Poland