A New Measurement of the Rare Decay $K^+\to π^+ μ^+ μ^-$

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dc.creatorMa, H.
dc.creatorAppel, R.
dc.creatorAtoyan, G. S.
dc.creatorBassalleck, B.
dc.creatorBergman, D.
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.creatorMajid, W.
dc.creatorMenzel, W.
dc.creatorPislak, S.
dc.creatorPoblaguev, A. A.
dc.creatorRehak, P.
dc.creatorSher, A.
dc.creatorThompson, J. A.
dc.creatorTruoel, P.
dc.creatorZeller, M. E.
dc.date1999-10-21
dc.date.accessioned2026-07-07T10:32:27Z
dc.date.available2026-07-07T10:32:27Z
dc.descriptionMore than 400 $K^{+}\toπ^{+}μ^+μ^-$ events were observed in a rare $K^+$ decay experiment at the AGS. Normalized to the $K^{+}\toπ^{+}π^+π^-$ decay, the branching ratio is determined to be $(9.22 \pm 0.60 (stat) \pm 0.49 (syst))\times 10^{-8}$. This branching ratio and the $μμ$ mass spectrum is in very good agreement with the measurement of the $K^{+}\toπ^{+}e^+e^-$ decay, but deviates significantly from the previous measurement.
dc.description4 pages, 6 figures in 7 eps files. Paper to be submitted to Phys Rev Lett
dc.identifierhttps://arxiv.org/abs/hep-ex/9910047
dc.identifierhttp://arxiv.org/abs/hep-ex/9910047
dc.identifierPhys.Rev.Lett.84:2580-2583,2000
dc.identifierdoi:10.1103/PhysRevLett.84.2580
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178757
dc.subjectHigh Energy Physics - Experiment
dc.titleA New Measurement of the Rare Decay $K^+\to π^+ μ^+ μ^-$
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