Improved sensitivity in a search for the rare decay [ital K][sub [ital L]][sup 0][r arrow][ital e][sup +][ital e[minus]]

In a search for the decay [ital K][sub [ital L]][sup 0][r arrow][ital e][sup +][ital e[minus]], no candidates have been observed. We determine the sensitivity from the detected number of [ital CP]-violating [ital K][sub [ital L]][sup 0][r arrow][pi][sup +][pi][sup [minus]] decays and place a 90% con...

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Veröffentlicht in:	Physical review letters 1993-12, Vol.71:24
Hauptverfasser:	Arisaka, K., Auerbach, L.B., Axelrod, S., Belz, J., Biery, K.A., Buchholz, P., Chapman, M.D., Cousins, R.D., Diwan, M.V., Eckhause, M., Ginkel, J.F., Guss, C., Hancock, A.D., Heinson, A.P., Highland, V.L., Hoffmann, G.W., Horvath, J., Irwin, G.M., Joyce, D., Kaarsberg, T., Kane, J.R., Kenney, C.J., Kettell, S.H., Kinnison, W.W., Knibbe, P., Konigsberg, J., Kuang, Y., Lang, K., Lee, D.M., Margulies, J., Mathiazhagan, C., McFarlane, W.K., McKee, R.J., Melese, P., Milner, E.C., Molzon, W.R., Ouimette, D.A., Riley, P.J., Ritchie, J.L., Rubin, P., Sanders, G.H., Schwartz, A.J., Sivertz, M., Slater, W.E., Urheim, J., Vulcan, W.F., Wagner, D.L., Welsh, R.E., Whyley, R.J., Winter, R.G., Witkowski, M.T., Wojcicki, S.G., Yamashita, A., Ziock, H.J.
Format:	Artikel
Sprache:	eng
Schlagworte:	662210 - Specific Theories & Interaction Models 662350 - Decays of Mesons- (1992-) ANTILEPTONS ANTIMATTER ANTIPARTICLES BOSONS BRANCHING RATIO CP INVARIANCE DECAY ELECTRONS ELEMENTARY PARTICLES FERMIONS HADRONS INVARIANCE PRINCIPLES KAONS KAONS NEUTRAL KAONS NEUTRAL LONG-LIVED LEPTONS MASSLESS PARTICLES MATTER MESONS Pa PARTICLE DECAY Particle Systematics- Unified Theories & Models- (1992-) PHOTONS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS PIONS MINUS PIONS PLUS POSITRONS PSEUDOSCALAR MESONS SENSITIVITY STRANGE MESONS STRANGE PARTICLES VIOLATIONS
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Zusammenfassung:	In a search for the decay [ital K][sub [ital L]][sup 0][r arrow][ital e][sup +][ital e[minus]], no candidates have been observed. We determine the sensitivity from the detected number of [ital CP]-violating [ital K][sub [ital L]][sup 0][r arrow][pi][sup +][pi][sup [minus]] decays and place a 90% confidence level upper limit on the branching ratio of [ital B]([ital K][sub [ital L]][sup 0][r arrow][ital e][sup +][ital e[minus]],[vert bar][ital M][sub [ital K]][minus][ital M][sub [ital e][ital e]][vert bar][lt]6 MeV/[ital c][sup 2])[le]4.1[times]10[sup [minus]11]. This result is a significant improvement over previous measurements, although still above the standard model prediction of 3[times]10[sup [minus]12].
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.71.3910