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

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dc.creatorFrlez, E.
dc.creatorPocanic, D.
dc.creatorBaranov, V. A.
dc.creatorBertl, W.
dc.creatorBychkov, M.
dc.creatorKhomutov, N. V.
dc.creatorKorenchenko, A. S.
dc.creatorKorenchenko, S. M.
dc.creatorKozlowski, T.
dc.creatorKravchuk, N. P.
dc.creatorKuchinsky, N. A.
dc.creatorLi, W.
dc.creatorMinehart, R. C.
dc.creatorMzhavia, D.
dc.creatorRitchie, B. G.
dc.creatorRitt, S.
dc.creatorRozhdestvensky, A. M.
dc.creatorSidorkin, V. V.
dc.creatorSmith, L. C.
dc.creatorSupek, I.
dc.creatorTsamalaidze, Z.
dc.creatorVanDevender, B. A.
dc.creatorVelicheva, E. P.
dc.creatorWang, Y.
dc.creatorWirtz, H. -P.
dc.creatorZiock, K. O. H.
dc.date2003-12-09
dc.date.accessioned2026-07-07T10:28:22Z
dc.date.available2026-07-07T10:28:22Z
dc.descriptionWe 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.
dc.description5 pages, 4 figures, 1 table, revtex4
dc.identifierhttps://arxiv.org/abs/hep-ex/0312029
dc.identifierhttp://arxiv.org/abs/hep-ex/0312029
dc.identifierPhys.Rev.Lett.93:181804,2004
dc.identifierdoi:10.1103/PhysRevLett.93.181804
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177423
dc.subjectHigh Energy Physics - Experiment
dc.titlePrecise Measurement of the Pion Axial Form Factor in the Pi+ -> e+ nu gamma Decay
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