Search for the decay $K_S \to \pi^0\gamma\gamma$ A. Lai , D Marras , J Richard Batley , A J Bevan , R S Dosanjh , T Gershon , G Kalmus , D J Munday , E O Olaiya , Michelle Parker , T O White , S A Wotton , G Barr , G Bocquet , A Ceccucci , T Cuhadardonszelmann , D Cundy , N Doble , V Falaleev , L Gatignon , A Gonidec , B Gorini , G Govi , P Grafstrom , W Kubischta , A Lacourt , Massimo Lenti , A Norton , S Palestini , B Panzersteindel , G Tatishvili , H Taureg , Mayda Velasco , H D Wahl , C Cheshkov , P Z Khristov , V Kekelidze , D Madigozhin , N Molokanova , Yu Potrebenikov , A L Tkachev , A Zinchenko , I G Knowles , C Lazzeroni , V Martin , R Sacco , A Walker , M Contalbrigo , Pietro Dalpiaz , J Duclos , P L Frabetti , A Gianoli , Marco Martini , L Masetti , Ferruccio Petrucci , M Savrie , A Bizzeti , M Calvetti , G Collazuol , G Graziani , E Iacopini , H G Becker , M Eppard , H Fox , Karen Holtz , A Kalter , Konrad Kleinknecht , U Koch , L Kopke , P Lopes Da Silva , P Marouelli , I Pellmann , Alexander Peters , B Renk , Stephan Schmidt , V Schonharting , Y Schue , R Wanke , A Winhart , M Wittgen , J C Chollet , L Fayard , L Iconomidoufayard , J Ocariz , G Unal , I Wingerterseez , G Anzivino , P Cenci , E Imbergamo , P Lubrano , A Mestvirishvili , A Nappi , Monica Pepe , Matthew Piccini , Rodolfo Carosi , R Casali , C Cerri , M Cirilli , F Costantini , R Fantechi , S Giudici , Italo Mannelli , G M Pierazzini , M Sozzi , J B Cheze , John G Cogan , M De Beer , P Debu , A Formica , Raphael Granier De Cassagnac , E Mazzucato , B Peyaud , R Turlay , B Vallage , M Holder , Andrew Maier , M Ziolkowski , R Arcidiacono , C Biino , N Cartiglia , Roberto Guida , F Marchetto , E Menichetti , N Pastrone , J Nassalski , E Rondio , M Szleper , W Wislicki , S Wronka , H Dibon , Gerhard Fischer , M Jeitler , M Markytan , I Mikulec , G Neuhofer , M Pernicka , A Taurok , L Widhalm PHYSICS LETTERS B（2003）
摘要
A search for the decay K-S --> pi(0)gammagamma has been made using the NA48 detector at the CERN SPS. Using data collected in 1999 during a 40-hour run with a high-intensity K-S beam, an upper limit for the branching ratio BR(K-S --> pi(0)gammagamma, z greater than or equal to 0.2) < 3.3 x 10(-7) has been obtained at 90% confidence level, where z = m(gammagamma)(2)/m(K0)(2). (C) 2003 Published by Elsevier Science B.V.
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关键词
K mesons decays, weak non-leptonic decays
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