Precise measurement of the decay K(L) ---> pi0 gamma gamma
- Lai, A
- Marras, D
- Bevan, A
- Dosanjh, Rs
- Gershon, Tj
- Hay, B
- Kalmus, Ge
- Lazzeroni, C
- Munday, Dj
- Needham, Md
- Olaiya, E
- Parker, Ma
- White, To
- Wotton, Sa
- Barr, G
- Bocquet, G
- Ceccucci, A
- Cuhadar Donszelmann, T
- Cundy, D
- D'Agostini, G
- Doble, N
- Falaleev, V
- Gatignon, L
- Gonidec, A
- Gorini, B
- Govi, G
- Grafstrom, P
- Kubischta, W
- Lacourt, A
- Lenti, M
- Luitz, S
- Mikulec, I
- Norton, A
- Palestini, S
- Panzer Steindel, B
- Tatishvili, G
- Taureg, H
- Velasco, M
- Wahl, H
- Cheshkov, C
- Hristov, P
- Kekelidze, V
- Madigojine, D
- Molokanova, N
- Potrebenikov, Y
- Zinchenko, A
- Knowles, I
- Martin, V
- Sacco, R
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- Contalbrigo, M
- Dalpiaz, P
- Duclos, J
- Frabetti, Pl
- Gianoli, A
- Martini, M
- Petrucci, F
- Savrie, M
- Bizzeti, A
- Calvetti, M
- Collazuol, G
- Graziani, G
- Iacopini, E
- Veltri, Michele
- Becker, Hg
- Eppard, M
- Fox, H
- Holtz, K
- Kalter, A
- Kleinknecht, K
- Koch, U
- Kopke, L
- da Silva, Pl
- Maruelli, P
- Pellmann, I
- Peters, A
- Renk, B
- Schmidt, Sa
- Schonharting, V
- Schue, Y
- Wanke, R
- Winhart, A
- Wittgen, M
- Chollet, Jc
- Fayard, L
- Iconomidou Fayard, L
- Ocariz, J
- Unal, G
- Wingerter Seez, I
- Anzivino, G
- Cenci, P
- Imbergamo, E
- Lubrano, P
- Mestvirishvili, A
- Nappi, A
- Pepe, M
- Piccini, M
- Carosi, R
- Casali, R
- Cerri, C
- Cirilli, M
- Costantini, F
- Fantechi, R
- Giudici, S
- Mannelli, I
- Pierazzini, G
- Sozzi, M
- Cheze, Jb
- Cogan, J
- De Beer, M
- Debu, P
- Formica, A
- de Cassagnac, Rg
- Mazzucato, E
- Peyaud, B
- Turlay, R
- Vallage, B
- Holder, M
- Maier, A
- Ziolkowski, M
- Arcidiacono, R
- Biino, C
- Cartiglia, N
- Clemencic, M
- Marchetto, F
- Menichetti, E
- Pastrone, N
- Nassalski, J
- Rondio, E
- Szleper, M
- Wislicki, W
- Wronka, S
- Dibon, H
- Fischer, G
- Jeitler, M
- Markytan, M
- Neuhofer, G
- Pernicka, M
- Taurok, A
- Widhalm, L.
DOIAbstract
The decay rate of K-L --> pi(o)gammagamma has been measured with the NA48 detector at the CERN SPS. A total of 2558 K-L --> pi(o)gammagamma candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 +/- 0.03((stat)) +/- 0.03((syst)) +/- 0.03((norm))) x 10(-6) and the vector coupling constant a(v) = -0.46 +/- 0.03((stat)) +/- 0.04((syst)). This result suggests that the CP-violation effects are dominating in the K-L --> pi(o)e(+)e(-) decay. An upper limit for the K-L --> pi(o)gammagamma decay rate in the two photon mass region m(gammagamma) < m(π)o is also given
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