PEN experiment: a precise measurement of the pi+ -> e+ nu decay branching fraction

Details PEN experiment: a precise measurement of the pi+ -> e+ nu decay branching fraction PEN experiment: a precise measurement of the pi+ -> e+ nu decay branching fraction

2009-09-24

arxiv.org/abs/0909.4358v1

AIP Conf.Proc.1182:698-701,2009

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 3 figures, talk given at the Tenth Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2009), La

Scientific paper

10.1063/1.3293904

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.

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