/ Experiment-HEP arXiv:0909.4358

PEN experiment: A Precise measurement of the pi+ ---> e+ nu decay branching fraction

Pocanic, D. (Virginia U.) ; Alonzi, L.P. (Virginia U.) ; Baranov, V.A. (Dubna, JINR) ; Bertl, W. (PSI, Villigen) ; Bychkov, M. (Virginia U.) ; Bystritsky, Yu.M. (Dubna, JINR) ; Frlez, E. (Virginia U.) ; Kalinnikov, V.A. (Dubna, JINR) ; Khomutov, N.V. (Dubna, JINR) ; Korenchenko, A.S. (Dubna, JINR) ; Korenchenko, S.M. (Dubna, JINR) ; Korolija, M. (Boskovic Inst., Zagreb) ; Kozlowski, T. (Lodz, IPJ) ; Kravchuk, N.P. (Dubna, JINR) ; Kuchinsky, N.A. (Dubna, JINR) ; Mekterovic, D. (Boskovic Inst., Zagreb) ; Mzhavia, D. (Tbilisi State U.) ; Palladino, A. (PSI, Villigen) ; Robmann, P. (Zurich U.) ; Rozhdestvensky, A.M. (Dubna, JINR) ; Shkarovskiy, S.N. (Dubna, JINR) ; Straumann, U. (Zurich U.) ; Supek, I. (Boskovic Inst., Zagreb) ; Truol, P. (Zurich U.) ; Tsamalaidze, Z. (Tbilisi State U.) ; van der Schaaf, A. (Zurich U.) ; Velicheva, E.P. (Dubna, JINR) ; Volnykh, V.P. (Dubna, JINR)

Published in: AIP Conf.Proc.
Year: 2009
Vol.: 1182
Page No: 698-701
Pages: 4

Abstract: A new measurement of $B_{\pi e2}$, the $\pi^+ \to e^+\nu(\gamma)$ decay branching ratio, is currently under way at the Paul Scherrer Institute. The present experimental result on $B_{\pi e2}$ constitutes the most accurate test of lepton universality available. The accuracy, however, still lags behind the theoretical precision by over an order of magnitude. Because of the large helicity suppression of the $\pi_{e2}$ decay, its branching ratio is susceptible to significant contributions from new physics, making this decay a particularly suitable subject of study.

Keyword(s): lepton decay ; muon decay ; hadrons

Web-Page: http://link.aip.org/link/?APC/1182/698; http://inspirebeta.net/record/832042/files/michel_energy_ps.png; http://inspirebeta.net/record/832042/files/muonpeak.png; http://inspirebeta.net/record/832042/files/pie_for_CIPANP_v2.png; http://inspirebeta.net/record/832042/files/pienu_michel_energy.png; http://inspirebeta.net/record/832042/files/pimue_for_CIPANP_v2.png; http://inspirebeta.net/record/832042/files/piondecaytimes.png; http://inspirebeta.net/record/832042/files/xsect_pen_2008.png

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