Electromagnetic radiative corrections to pionic beta decay π^+ to π^0 e^+ ν_e

Details Electromagnetic radiative corrections to pionic beta decay π^+ to π^0 e^+ ν_e Electromagnetic radiative corrections to pionic beta decay π^+ to π^0 e^+ ν_e

2002-09-25

arxiv.org/abs/hep-ph/0209293v1

Nucl.Phys.Proc.Suppl.121:191-194,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, contribution to Proc. of QCD 02, Montpellier, July 2002

Scientific paper

10.1016/S0920-5632(03)01844-9

Pionic beta decay \pi^+ to \pi^0 e^+ \nu_e is analyzed in chiral perturbation theory with virtual photons and leptons. All electromagnetic corrections up to order e^2 p^2 are taken into account. Theoretical results are confronted with preliminary data from a PSI measurement and a value for the CKM matrix element |Vud| is given. Although the precision is presently still below the one of existing determinations of |Vud|, an analysis of pionic beta decay, based on a systematic treatment within a low-energy effective field theory, may become a useful alternative.

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