The K-S --> gammagamma 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 gammagamma) = (2.78 +/- 0.06(stat) +/- 0.04(syst)) x 10(-6), obtained from 7461 +/- 172 K-S --> gammagamma events, is significantly higher than the O(p(4)) prediction of chiral perturbation theory. Using a K-L beam the ratio Gamma(K-L-->gammagamma)/Gamma(K-L-->pi(0)pi(0)pi(0)) = (2.81 +/- 0.01(stat) +/- 0.02(syst)) x 10(-3) has been measured. (C) 2002 Elsevier Science B.V All rights reserved.
Autori interni: | |
Autori: | 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 M; Dalpiaz P; Duclos J; Frabetti PL; Gianoli A; Martini M; Petrucci E; 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; 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 |
Titolo: | Precise measurements of the K-s -> gamma gamma and K-L -> gamma gamma decay rates |
Anno del prodotto: | 2003 |
Digital Object Identifier (DOI): | 10.1016/S0370-2693(02)02955-6 |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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