First Observation of the Rare Decay Mode K-long -> e+ e-

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dc.creatorBNL E871 Collaboration
dc.creatorAmbrose, D.
dc.creatorArroyo, C.
dc.creatorBachman, M.
dc.creatorde Cecco, P.
dc.creatorConnor, D.
dc.creatorEckhause, M.
dc.creatorEcklund, K. M.
dc.creatorGraessle, S.
dc.creatorHancock, A. D.
dc.creatorHartman, K.
dc.creatorHebert, M.
dc.creatorHoff, C. H.
dc.creatorHoffmann, G. W.
dc.creatorIrwin, G. M.
dc.creatorKane, J. R.
dc.creatorKanematsu, N.
dc.creatorKuang, Y.
dc.creatorLang, K.
dc.creatorLee, R.
dc.creatorMartin, R. D.
dc.creatorMcDonough, J.
dc.creatorMilder, A.
dc.creatorMolzon, W. R.
dc.creatorPommot-Maia, M.
dc.creatorRiley, P. J.
dc.creatorRitchie, J. L.
dc.creatorRubin, P. D.
dc.creatorVassilakopoulos, V. I.
dc.creatorWare, C. B.
dc.creatorWelsh, R. E.
dc.creatorWojcicki, S. G.
dc.creatorWolin, E.
dc.creatorWorm, S.
dc.date1998-10-01
dc.date.accessioned2026-07-07T10:32:20Z
dc.date.available2026-07-07T10:32:20Z
dc.descriptionIn an experiment designed to search for and study very rare two-body decay modes of the K-long, we have observed four examples of the decay K-long -> e+ e-, where the expected background is 0.17+-0.10 events. This observation translates into a branching fraction of 8.7^{+5.7}_{-4.1} X 10^{-12}, consistent with recent theoretical predictions. This result represents by far the smallest branching fraction yet measured in particle physics.
dc.description9 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/hep-ex/9810007
dc.identifierhttp://arxiv.org/abs/hep-ex/9810007
dc.identifierPhys.Rev.Lett.81:4309-4312,1998
dc.identifierdoi:10.1103/PhysRevLett.81.4309
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178721
dc.subjectHigh Energy Physics - Experiment
dc.titleFirst Observation of the Rare Decay Mode K-long -> e+ e-
dc.typetext

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