Probing the Standard Model via rare pion and muon decays

Details Probing the Standard Model via rare pion and muon decays Probing the Standard Model via rare pion and muon decays

2006-06-12

arxiv.org/abs/hep-ex/0606023v1

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 5 postscript figures, 2 tables, LaTeX, presented at the International Workshop e+e- Collisions from phi to psi, Febru

Scientific paper

10.1016/j.nuclphysbps.2006.09.07

The PIBETA collaboration has used a non-magnetic pure CsI calorimeter operating at the Paul Scherrer Institute to collect the world's largest sample of rare pion and muon decays. We have extracted the absolute pi+ -> pi0 e+ nu decay branching ratio with the 0.55 % total uncertainty. The pi+ -> e + nu gamma data set was used to extract weak axial and vector form factors F_A and F_V, yielding a significant improvement in the precision of F_A and F_V. The mu+ -> e+ nu nu gamma distributions were well described with the two-parameter (rho_SM,eta_bar=0) solution. These results bring major improvements in accuracy over the current Particle Data Group listings and agree well with the predictions of the Standard Model.

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