Article

Measurement of the $K_{L} \to e^{+}e^{-}e^{+} e^{-}$ Decay Rate

A. Lai, I G Bearden, D Marras, J Richard Batley, R S Dosanjh, T. J. Gershon, George Ernest Kalmus, C Lazzeroni, D J Munday, E Olaiya, M A Parker, T O White, S A Wotton, R Arcidiacono, G Barr, G Bocquet, Augusto Ceccucci, T Çuhadar-Dönszelmann, Donald C Cundy, Niels T Doble, V P Falaleev, L Gatignon, A Gonidec, B Gorini, P Grafström, Werner Kubischta, A Lacourt, A Norton, B Panzer-Steindel, G T Tatishvili, H Wahl, C Cheshkov, P Z Khristov, V D Kekelidze, D T Madigozhin, N A Molokanova, Yu K Potrebenikov, A I Zinchenko, V Martin, P Rubin, R Sacco, A Walker, M. Contalbrigo, Pietro Dalpiaz, J Duclos, P L Frabetti, A Gianoli, M Martini, F Petrucci, M Savrié, 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 Köpke, P Lopes da Silva, P Marouelli, I Mestvirishvili, I A Pellmann, A Peters, S A Schmidt, V Schönharting, Yu Schué, R Wanke, A Winhart, M Wittgen, J C Chollet, Louis Fayard, L Iconomidou-Fayard, G Unal, I Wingerter-Seez, Giuseppina Anzivino, P Cenci, E Imbergamo, P Lubrano, A Mestvirishvili, A Nappi, M Pepé, M Piccini, R Casali, C Cerri, M Cirilli, F Costantini, R Fantechi, Luca Fiorini, Sergio Giudici, I Mannelli, G M Pierazzini, M Sozzi, J B Chèze, M De Beer, P Debu, F. Derue, A Formica, R Granier de Cassagnac, G Gouge, Gérard Marel, E Mazzucato, B Peyaud, René Turlay, B Vallage, M Holder, A Maier, M Ziolkowski, C Biino, N Cartiglia, F Marchetto, E Menichetti, N Pastrone, J P Nassalski, Ewa Rondio, M Szleper, W Wislicki, S Wronka, Heinz Dibon, Manfred Jeitler, Manfred Markytan, I Mikulec, Günther Neuhofer, Manfred Pernicka, Anton Taurok, L Widhalm, D Beavis, C Besliu, B Budick, H Bøggild, C Chasman, C H Christensen, P. Christiansen, J. Cibor, R Debbe, E Enger, J J Gaardhøje, M Germinario, K. Hagel, H Ito, A Jipa, F. Jundt, J I Jordre, C. E. Jorgensen, R Karabowicz, E J Kim, T Kozik, T M Larsen, J H Lee, Y K Lee, S. Lindal, R Lystad, G Løvhøiden, Z. Majka, A. Makeev, M Mikelsen, M Murray, J. B. Natowitz, B Neumann, B S Nielsen, D Ouerdane, R Planeta, F. Rami, C Ristea, O Ristea, D Röhrich, B H Samset, D Sandberg, S J Sanders, R A Scheetz, P. Staszel, T S Tveter, F. Videbaek, R. Wada, Z Yin, I S Zgura

DOI:http://cdsweb.cern.ch/record/828068/files/phep-2005-005.ps.gz
Source: OAI

ABSTRACT The decay rate of the long-lived neutral K meson into the e^+ e^- e^+ e^- final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1998 and 1999, a total of 200 events has been observed with negligible background. This observation corresponds to a branching ratio of Br(K_L -> e^+ e^- e^+ e^-) = (3.30 + - 0.24_stat + - 0.23_sys + - 0.10_norm) x 10^-8.

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Keywords

decay rate
 
long-lived neutral K meson
 
NA48 detector
 
negligible background