In:
International Journal of Modern Physics: Conference Series, World Scientific Pub Co Pte Ltd, Vol. 35 ( 2014-01), p. 1460437-
Abstract:
Simple dynamics, few available decay channels, and highly controlled radiative and loop corrections, make pion and muon decays a sensitive means of exploring details of the underlying symmetries. We review the current status of the rare decays: π + → e + ν (π e2 ), π + → e + νγ (π e2γ ), π + → π 0 e + ν (π e3 ), and [Formula: see text]. For the latter we report new preliminary values for the branching ratio B(E γ 〉 10 MeV , θ eγ 〉 30°) = 4.365 (9) stat (42) syst × 10 -3 , and the decay parameter [Formula: see text], both in excellent agreement with standard model predictions. We review recent measurements, particularly by the PIBETA and PEN experiments, and near-term prospects for improvement. These and other similar precise low energy studies complement modern collider results materially.
Type of Medium:
Online Resource
ISSN:
2010-1945
,
2010-1945
DOI:
10.1142/S2010194514604372
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
2014
detail.hit.zdb_id:
2704621-7
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