First observation of the $K_{S}\to \pi^{0}\gamma\gamma$ decay

Using the NA48 detector at the CERN SPS, 31 $K_{S}\to \pi^{0}\gamma\gamma$ candidates with an estimated background of $13.7 \pm 3.2$ events have been observed. This first observation leads to a branching ratio of $BR(K_{S}\to \pi^{0}\gamma\gamma)_{z>0.2} = (4.9 \pm 1.6_{stat} \pm 0.9_{syst}) \tim...

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Detalles Bibliográficos
Autores principales: Lai, A., Marras, D., Batley, J.R., Dosanjh, R.S., Gershon, T.J., Kalmus, G.E., Lazzeroni, C., Munday, D.J., Olaiya, E., Parker, Michael Andrew, White, T.O., Wotton, S.A., Arcidiacono, R., Barr, G., Bocquet, G., Ceccucci, A., Cuhadar-Donszelmann, T., Cundy, D., Doble, N., Falaleev, V., Gatignon, L., Gonidec, A., Gorini, B., Grafstrom, P., Kubischta, W., Lacourt, A., Norton, A., Panzer-Steindel, B., Tatishvili, G., Wahl, Heinrich, Cheshkov, C., Hristov, P., Kekelidze, V., Madigojine, D., Molokanova, N., Potrebenikov, Yu., Zinchenko, A., Martin, V., Rubin, P., Sacco, R., Walker, A., Contalbrigo, M., Dalpiaz, P., Duclos, J., Frabetti, P.L., Gianoli, A., Martini, M., Petrucci, F., Savrie, M., Bizzeti, A., Calvetti, M., Collazuol, G., Graziani, G., Iacopini, E., Lenti, M., Martelli, F., Veltri, M., Eppard, M., Hirstius, A., Holtz, K., Kleinknecht, K., Koch, U., Kopke, L., Lopes da Silva, P., Marouelli, P., Mestvirishvili, I., Pellmann, I., Peters, A., Schmidt, S.A., Schonharting, V., Schue, Y., Wanke, R., Winhart, A., Wittgen, M., Chollet, J.C., Fayard, L., Iconomidou-Fayard, L., Unal, G., Wingerter-Seez, I., Anzivino, G., Cenci, P., Imbergamo, E., Lubrano, P., Mestvirishvili, A., Nappi, A., Pepe, M., Piccini, M., Casali, R., Cerri, C., Cirilli, M., Costantini, F., Fantechi, R., Fiorini, L., Giudici, S., Mannelli, I., Pierazzini, G., Sozzi, M., Cheze, J.B., De Beer, M., Debu, P., Derue, F., Formica, A., Granier de Cassagnac, R., Gouge, G., Marel, G., Mazzucato, E., Peyaud, B., Turlay, R., Vallage, B., Holder, M., Maier, A., Ziolkowski, M., Biino, C., Cartiglia, N., Marchetto, F., Menichetti, Ezio A., Pastrone, N., Nassalski, J., Rondio, E., Szleper, M., Wislicki, W., Wronka, S., Dibon, H., Jeitler, M., Markytan, M., Mikulec, I., Neuhofer, G., Pernicka, M., Taurok, A., Widhalm, L.
Lenguaje:eng
Publicado: 2003
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2003.10.073
http://cds.cern.ch/record/642157
Descripción
Sumario:Using the NA48 detector at the CERN SPS, 31 $K_{S}\to \pi^{0}\gamma\gamma$ candidates with an estimated background of $13.7 \pm 3.2$ events have been observed. This first observation leads to a branching ratio of $BR(K_{S}\to \pi^{0}\gamma\gamma)_{z>0.2} = (4.9 \pm 1.6_{stat} \pm 0.9_{syst}) \times 10^{-8}$ in agreement with Chiral Perturbation theory predictions.

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