New, high statistics measurement of the K+ -> pi0 e+ nu (Ke3) branching ratio

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dc.creatorSher, A.
dc.creatorAppel, R.
dc.creatorAtoyan, G. S.
dc.creatorBassalleck, B.
dc.creatorBergman, D. R.
dc.creatorCheung, N.
dc.creatorDhawan, S.
dc.creatorDo, H.
dc.creatorEgger, J.
dc.creatorEilerts, S.
dc.creatorFischer, H.
dc.creatorHerold, W.
dc.creatorIssakov, V. V.
dc.creatorKaspar, H.
dc.creatorKraus, D. E.
dc.creatorLazarus, D. M.
dc.creatorLichard, P.
dc.creatorLowe, J.
dc.creatorLozano, J.
dc.creatorMa, H.
dc.creatorMajid, W.
dc.creatorPislak, S.
dc.creatorPoblaguev, A. A.
dc.creatorRehak, P.
dc.creatorSher, Aleksey
dc.creatorThompson, J. A.
dc.creatorTruol, P.
dc.creatorZeller, M. E.
dc.date2003-05-16
dc.date2004-07-12
dc.date.accessioned2026-07-07T10:28:18Z
dc.date.available2026-07-07T10:28:18Z
dc.descriptionE865 at the Brookhaven National Laboratory AGS collected about 70,000 K+(e3) events with the purpose of measuring the relative K+(e3) branching ratio. The pi0 in all the decays was detected using the e+e- pair from pi0 -> e+e-gamma decay and no photons were required. Using the Particle Data Group branching ratios for the normalization decays we obtain BR(K+(e3(gamma))=(5.13+/-0.02(stat)+/-0.09(sys)+/-0.04(norm))%, where $K+(e3(gamma)) includes the effect of virtual and real photons. This result is 2.3 sigma higher than the current Particle Data Group value. The implications of this result for the $V_{us}$ element of the CKM matrix, and the matrix's unitarity are discussed.
dc.description4 pages, 5 figures; final version accepted by PRL
dc.identifierhttps://arxiv.org/abs/hep-ex/0305042
dc.identifierhttp://arxiv.org/abs/hep-ex/0305042
dc.identifierPhys.Rev.Lett.91:261802,2003
dc.identifierdoi:10.1103/PhysRevLett.91.261802
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177404
dc.subjectHigh Energy Physics - Experiment
dc.titleNew, high statistics measurement of the K+ -> pi0 e+ nu (Ke3) branching ratio
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