Speaker
Alberto Lusiani
(Scuola Normale Superiore and INFN, sezione di Pisa)
Description
A dedicated study of additional radiation in e+e−→μ+μ−γ and e+e−→π+π−γ initial-state-radiation events is presented using the full BABAR data sample. Results are presented at next-to- and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. Comparison with predictions from Phokhara and AfkQed Monte Carlo generators is performed, revealing discrepancies in the one-photon rates and angular distributions for the former. This disagreement has a negligible effect on the BABAR measurement of the e+e−→π+π−(γ) cross section, but may affect other measurements significantly.
Name of collaboration or list of co-authors
BaBar collaboration
Primary author
Alberto Lusiani
(Scuola Normale Superiore and INFN, sezione di Pisa)
