Probing the Standard Model via rare pion and muon decays
Abstract
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.
Cite
@article{arxiv.hep-ex/0606023,
title = {Probing the Standard Model via rare pion and muon decays},
author = {Emil Frlez},
journal= {arXiv preprint arXiv:hep-ex/0606023},
year = {2009}
}
Comments
5 pages, 5 postscript figures, 2 tables, LaTeX, presented at the International Workshop e+e- Collisions from phi to psi, February 27 - March 2, 2006, Budker Institute of Nuclear Physics, Novosibirsk, Russia (http://www.inp.nsk.su/conf/phipsi06), to appear in Nuclear Physics B (Proceedings Supplement)