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Search for the decay $K_{s} \to \pi^{0}\gamma\gamma$

A. Lai D. Marras R. Batley A. Bevan R S. Dosanjh T J. Gershon G E. Kalmus D J. Munday E. Olaiya M A. Parker T. White S A. Wotton G. Barr G. Bocquet A. Ceccucci T. Cuhadar-Donszelmann C. Cundy Donald N. Doble V P. Falaleev L. Gatignon A. Gonidec B. Gorini G. Govi P. Grafstrom W. Kubischta A. Lacourt M. Lenti A. Norton S. Palestini B. Panzer-Steindel G T. Tatishvili H. Taureg M. Velasco H. Wahl C. Cheshkov P Z. Khristov V. Kekelidze D. Madigojine N. Molokanova K. Potrebenikov Yu a L. Tkachev a I. Zinchenko I. Knowles C. Lazzeroni V. Martin R. Sacco A. Walker M. Contalbrigo P. Dalpiaz J. Duclos P L. Frabetti A. Gianoli M. Martini L. Masetti F. Petrucci M. Savrie A. Bizzeti M. Calvetti G. Collazuol G. Graziani E. Iacopini H G. Becker M. Eppard H. Fox K. Holtz A. Kalter K. Kleinknecht U. Koch L. Kopke P. Lopes da Silva P. Marouelli I. Pellmann A. Peters B. Renk S A. Schmidt V. Schonharting Y. Schue R. Wanke A. Winhart M. Wittgen J C. Chollet 1 L. Fayard 1 L. Iconomidou-Fayard 1 J. Ocariz 1 G. Unal 1 I. Wingerter 1 G. Anzivino P. Cenci E. Imbergamo P. Lubrano A. Mestvirishvili A. Nappi M. Pepe M. Piccini R. Carosi R. Casali C. Cerri M. Cirilli F. Costantini R. Fantechi S. Giudici I. Mannelli G M. Pierazzini M. Sozzi J B. Cheze J. Cogan M. de Beer P. Debu A. Formica R. Granier de Cassagnac E. Mazzucato B. Peyaud R. Turlay B. Vallage M. Holder A. Maier M. Ziolkowski R. Arcidiacono C. Biino N. Cartiglia R. Guida F. Marchetto E. Menichetti N. Pastrone J. Nassalski E. Rondio M. Szleper W. Wislicki S. Wronka Heinz. Dibon G. Fischer M. Jeitler Manfred. Markytan I. Mikulec Gunther. Neuhofer Manfred. Pernicka Anton. Taurok L. Widhalm
Abstract : A search for the decay K_S -> pi0gammagamma 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, an upper limit for the branching ratio BR (K_S -> pi0gammagamma,z = 0.2) 3.3 x 10-7 has been obtained at 90% confidence level, where z = m^2_gammagamma/m^2_K_0.
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Submitted on : Thursday, March 27, 2003 - 10:58:41 AM
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A. Lai, D. Marras, R. Batley, A. Bevan, R S. Dosanjh, et al.. Search for the decay $K_{s} \to \pi^{0}\gamma\gamma$. Physics Letters B, Elsevier, 2002, 556, pp.105-113. ⟨in2p3-00012604⟩

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