Precise Measurement of the Pion Axial Form Factor in the Pi+ -> e+ nu gamma Decay

Details Precise Measurement of the Pion Axial Form Factor in the Pi+ -> e+ nu gamma Decay Precise Measurement of the Pion Axial Form Factor in the Pi+ -> e+ nu gamma Decay

2003-12-09

arxiv.org/abs/hep-ex/0312029v1

Phys.Rev.Lett.93:181804,2004

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures, 1 table, revtex4

Scientific paper

10.1103/PhysRevLett.93.181804

We have studied radiative pion decays Pi+ -> e+ nu gamma in three broad kinematic regions using the PIBETA detector and a stopped pion beam. Based on Dalitz distributions of 42,209 events we have evaluated absolute Pi -> e nu gamma branching ratios in the three regions. Minimum chi^2 fits to the integral and differential (E(e+),E(gamma)) distributions result in the axial-to-vector weak form factor ratio of gamma = F_A/F_V = 0.443(15),or F_A = 0.0115(4) with F_V = 0.0259. However, deviations from Standard Model predictions in the high-E(gamma)/low-E(e+) kinematic region indicate the need for further theoretical and experimental work.

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