The K_S --> gamma gamma decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR(K_S --> gamma gamma)=(2.78±0.06stat±0.04syst)×10−6, obtained from 7461±172 K_S --> gamma gamma, is significantly higher than the O(p4) prediction of chiral perturbation theory. Using a KL beam the ratio Gamma(K_L --> gamma gamma)/ Gamma(K_L --> pi0 pi0 pi0) = (2.81 +- 0.01stat +- 0.02syst) has been measured.

Precise measurements of the K_S --> gamma gamma and K_L --> gamma gamma decay rates

CONTALBRIGO, Marco;DALPIAZ, Pietro;GIANOLI, Alberto;MARTINI, Mara;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;
2003

Abstract

The K_S --> gamma gamma decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR(K_S --> gamma gamma)=(2.78±0.06stat±0.04syst)×10−6, obtained from 7461±172 K_S --> gamma gamma, is significantly higher than the O(p4) prediction of chiral perturbation theory. Using a KL beam the ratio Gamma(K_L --> gamma gamma)/ Gamma(K_L --> pi0 pi0 pi0) = (2.81 +- 0.01stat +- 0.02syst) has been measured.
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 DOSZELMANN, T; Cundy, D; Doble, N; Falaleev, V; Gatignon, L; Gonidec, A; Gorini, B; Grafstrom, P; Kubischta, W; Lacourt, A; Mikulec, I; 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, Marco; Dalpiaz, Pietro; Duclos, J; Frabetti, Pl; Gianoli, Alberto; Martini, Mara; Petrucci, Ferruccio Carlo; Savrie', Mauro; 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; Schoharting, 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, F; Fantechi, R; Fiorini, L; Giudici, S; Mannelli, I; Pierazzini, G; Sozzi, M; 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; 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/11392/1211645
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