Using the NA48 detector at the CERN SPS, 31 K-S --> pi(0)gammagamma candidates with an estimated background of 13.7 +/- 3.2 events have been observed. This first observation leads to a branching ratio of BR(K-S --> pi(0)gammagamma)(z>0.2) = (4.9 +/- 1.6(stat) +/- 0.9(syst)) x 10(-8) in agreement with Chiral Perturbation Theory predictions. (C) 2003 Elsevier B.V. All rights reserved.

First observation of the K-S -> pi(0)gamma gamma decay

COSTANTINI, FLAVIO;GIUDICI, SERGIO;SOZZI, MARCO STANISLAO;
2004-01-01

Abstract

Using the NA48 detector at the CERN SPS, 31 K-S --> pi(0)gammagamma candidates with an estimated background of 13.7 +/- 3.2 events have been observed. This first observation leads to a branching ratio of BR(K-S --> pi(0)gammagamma)(z>0.2) = (4.9 +/- 1.6(stat) +/- 0.9(syst)) x 10(-8) in agreement with Chiral Perturbation Theory predictions. (C) 2003 Elsevier B.V. All rights reserved.
2004
Lai, A; Marras, D; Batley, Jr; Dosanjh, Rs; Gershon, Tj; Kalmus, Ge; Lazzeroni, C; Munday, Dj; Olaiya, E; Parker, Ma; White, To; Wotton, Sa; 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, H; Cheshkov, C; Hristov, P; Kekelidze, V; Madigojine, D; Molokanova, N; Potrebenikov, Y; Zinchenko, A; Martin, V; Rubin, P; Sacco, R; Walker, A; Contalbrigo, M; Dalpiaz, P; Duclos, J; Frabetti, Pl; 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; da Silva, Pl; Marouelli, P; Mestvirishvili, I; Pellmann, I; Peters, A; Schmidt, Sa; Schonharting, V; Schue, Y; Wanke, R; Winhart, A; Wittgen, M; Chollet, Jc; 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, Flavio; Fantechi, R; Fiorini, L; Giudici, Sergio; Mannelli, I; Pierazzini, G; Sozzi, MARCO STANISLAO; Cheze, Jb; De Beer, M; Debu, P; Derue, F; Formica, A; de Cassagnac, Rg; 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, E; 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/188295
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