Observation of the rare decays $K_{S} \to \pi^{0} \mu^{+} \mu^{-}$

A search for the decay $K_{S} \to \pi^{0} \mu^{+} \mu^{-}$ has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high intensity $K_{S}$ beam. Six events were found with a background expectation of $0.22^{+0.18}_{0.11}$ events. Using a vecto...

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Detalles Bibliográficos
Autores principales: Batley, J.R., Kalmus, G.E., Lazzeroni, C., Munday, D.J., Patel, M., Slater, M.W., Wotton, S.A., Arcidiacono, R., Bocquet, G., Ceccucci, A., Cundy, D., Doble, N., Falaleev, V., Gatignon, L., Gonidec, A., Grafstrom, P., Kubischta, W., Marchetto, F., Mikulec, I., Norton, A., Panzer-Steindel, B., Rubin, P., Wahl, H., Monnier, E., Swallow, E., Winston, R., Goudzovski, E., Gurev, D., Hristov, P., Kekelidze, V., Kozhuharov, V., Litov, L., Madigozhin, D., Molokanova, N., Potrebenikov, Yu., Stoynev, S., Zinchenko, A., Sacco, R., Walker, A., Baldini, W., Dalpiaz, P., Duclos, J., Frabetti, P.L., Gianoli, A., Martini, M., Petrucci, F., Scarpa, M., Savrie, M., Bizzeti, A., Calvetti, M., Graziani, G., Iacopini, E., Lenti, M., Martelli, F., Ruggiero, G., Veltri, M., Behler, M., Eppard, K., Eppard, M., Hirstius, A., Kleinknecht, K., Koch, U., Masetti, L., Marouelli, P., Moosbrugger, U., Morales Morales, C., Peters, A., Wanke, R., Winhart, A., Dabrowski, A., Fonseca Martin, T., Szleper, M., Velasco, M., Anzivino, G., Cenci, P., Imbergamo, E., Lamanna, G., Lubrano, P., Michetti, A., Nappi, A., Pepe, M., Petrucci, M.C., Piccini, M., Valdata, M., Cerri, C., Collazuol, G., Costantini, F., Fantechi, R., Fiorini, L., Giudici, S., Mannelli, I., Pierazzini, G., Sozzi, M., Cheshkov, C., Cheze, J.B., De Beer, M., Debu, P., Gouge, G., Marel, G., Mazzucato, E., Peyaud, B., Vallage, B., Holder, M., Maier, A., Ziolkowski, M., Biino, C., Cartiglia, N., Clemencic, M., Goy-Lopez, S., Menichetti, Ezio A., Pastrone, N., Wislicki, W., Dibon, H., Jeitler, M., Markytan, M., Neuhofer, G., Widhalm, L.
Lenguaje:eng
Publicado: 2004
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2004.08.058
http://cds.cern.ch/record/777240
Descripción
Sumario:A search for the decay $K_{S} \to \pi^{0} \mu^{+} \mu^{-}$ has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high intensity $K_{S}$ beam. Six events were found with a background expectation of $0.22^{+0.18}_{0.11}$ events. Using a vector matrix element and unit form factor, the measured branching ratio is $B(K_{S} \to \pi^{0}\mu^{+}\mu^{-}) = [2.9^{+1.5}_{-1.2}(stat) \pm 0.2(syst)] \times 10^{9}$.

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