Precise measurements of the $K_{S}\to\gamma\gamma$ and $K_{L}\to\gamma\gamma$ decay rates
- Lai, A.
- Marras, D.
- Batley, J.R.
- Dosanjh, R.S.
- Gershon, T.J.
- Kalmus, G.E.
- Lazzeroni, C.
- Munday, D.J.
- Olaiya, E.
- Parker, Michael Andrew
- White, T.O.
- Wotton, S.A.
- Arcidiacono, R.
- Barr, G.
- Bocquet, G.
- Ceccucci, A.
- Cuhadar-Donszelmann, 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, Heinrich
- Cheshkov, C.
- Hristov, P.
- Kekelidze, V.
- Madigojine, D.
- Molokanova, N.
- Potrebenikov, Yu.
- Zinchenko, A.
- Martin, V.
- Rubin, P.
- Sacco, R.
- Walker, A.
- Contalbrigo, M.
- Dalpiaz, P.
- Duclos, J.
- Frabetti, P.L.
- Gianoli, A.
- Martini, M.
- Petrucci, F.
- 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.
- Lopes da Silva, P.
- Marouelli, P.
- Mestvirishvili, I.
- Pellmann, I.
- Peters, A.
- Schmidt, S.A.
- Schonharting, V.
- Schue, Y.
- Wanke, R.
- Winhart, A.
- Wittgen, M.
- Chollet, J.C.
- 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, J.B.
- De Beer, M.
- Debu, P.
- Derue, F.
- Formica, A.
- Granier de Cassagnac, R.
- 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, Ezio A.
- 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.
DOIAbstract
The $K_{S} \to \gamma\gamma$ 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($K_{S}) \to \gamma\gamma = (2.78 \pm 0.06_{stat} \pm 0.04_{syst}) \times 10^{-6}$, obtained from 7461$\pm$172 $K_{S} \to \gamma\gamma$ events, is significantly higher than the $O(p^{4})$ prediction of Chiral Perturbation Theory. Using a $K_{L}$ beam the ratio $\Gamma(K_{L} \to \gamma\gamma)/ \Gamma(K_{L} \to \pi^{0}\pi^{0}\pi^{0}) = (2.81 \pm 0.01_{stat} \pm 0.02_{syst}) \times 10^{-3}$ has been measured.The K S → γγ 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 → γγ...
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