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Precise measurements of the $K_{S} \to \gamma\gamma$ and $K_{L} \to \gamma\gamma$ decay rates

A. Lai D. Marras J R. Batley R S. Dosanjh T J. Gershon G E. Kalmus C. Lazzeroni D J. Munday E. Olaiya M A. Parker T O. White S A. Wotton R. Arcidiacono G. Barr G. Bocquet A. Ceccucci T. Cuhadar-Donszelmann D. Cundy N. Doble V. Falaleev L. Gatignon A. Gonidec B. Gorini P. Grafstrom W. Kubischta A. Lacourt I. Mikulec A. Norton B. Panzer-Steindel G. Tatishvili H. Wahl C. Cheshkov P Z. Khristov V D. Kekelidze D. Madigojine N. Molokanova Yu. Potrebenikov A. Zinchenko V. Martin P. Rubin R. Sacco A. Walker M. Contalbrigo P. Dalpiaz J. Duclos P L. Frabetti A. Gianoli M. Martini F. Petrucci M. Savrie A. Bizzeti M. Calvetti G. Collazuol G. Graziani E. Iacopini M. Lenti F. Martelli M. Veltri M. Eppard A. Hirstius K. Holtz K. Kleinknecht U. Koch L. Kopke P. Lopesda P. Marouelli I. Mestvirishvili I. Pellmann A. Peters S A. Schmidt V. Schonharting Y. Schue R. Wanke A. Winhart M. Wittgen J C. Chollet 1 L. Fayard 1 L. Iconomidou-Fayard 1 G. Unal 1 I. Wingerter-Seez 1 G. Anzivino P. Cenci E. Imbergamo P. Lubrano A. Mestvirishvili A. Nappi M. Pepe M. Piccini R. Casali C. Cerri M. Cirilli F. Costantini R. Fantechi L. Fiorini S. Giudici I. Mannelli G. Pierazzini M. Sozzi J B. Cheze M. de Beer P. Debu F. Derue A. Formica R. Granier de Cassagnac G. Gouge G. Marel E. Mazzucato B. Peyaud R. Turlay B. Vallage M. Holder A. Maier M. Ziolkowski C. Biino N. Cartiglia F. Marchetto E. Menichetti N. Pastrone J. Nassalski E. Rondio M. Szleper W. Wislicki S. Wronka H. Dibon M. Jeitler M. Markytan G. Neuhofer M. Pernicka A. Taurok L. Widhalm
Abstract : Affiliations: CERN Imprint: 10 Oct 2002 Pages: 10 p Subjects: Particle Physics - Experimental Results Accelerator: CERN SPS Experiment: NA48 (CERN Expt. Grey Book) ; Divisional affiliation: EP See record at SLAC Abstract: 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^0pi^0pi^0 = (2.81 +- 0.01_{stat} +- 0.02_{syst}) x 10^{-3} has been measured.
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Submitted on : Monday, January 20, 2003 - 2:26:43 PM
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A. Lai, D. Marras, J R. Batley, R S. Dosanjh, T J. Gershon, et al.. Precise measurements of the $K_{S} \to \gamma\gamma$ and $K_{L} \to \gamma\gamma$ decay rates. Physics Letters B, Elsevier, 2003, 551, pp.7-15. ⟨in2p3-00013691⟩

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