151. Measurement of the ratio Γ (KL → π+ π-) / Γ (KL → π± e∓ ν) and extraction of the CP violation parameter | η+
- Author
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Lai, A, Marras, D, Bevan, A, Dosanjh, RS, Gershon, TJ, Hay, B, Kalmus, GE, Lazzeroni, C, Munday, DJ, Olaiya, E, Parker, MA, White, TO, Wotton, SA, Barr, G, Bocquet, G, Ceccucci, A, Cuhadar-Dönszelmann, T, Cundy, D, D'Agostini, G, Doble, N, Falaleev, V, Gatignon, L, Gonidec, A, Gorini, B, Govi, G, Grafström, P, Kubischta, W, Lacourt, A, Norton, A, Palestini, S, Panzer-Steindel, B, Taureg, H, Velasco, M, Wahl, H, Cheshkov, C, Gaponenko, A, Hristov, P, Kekelidze, V, Litov, L, Madigozhin, D, Molokanova, N, Potrebenikov, Y, Stoynev, S, Tatishvili, G, Tkatchev, A, Zinchenko, A, Knowles, I, Martin, V, Sacco, R, Walker, A, Contalbrigo, M, Dalpiaz, P, Duclos, J, Frabetti, PL, Gianoli, A, Martini, M, Petrucci, F, Savrié, M, Bizzeti, A, Calvetti, M, Collazuol, G, Graziani, G, Iacopini, E, Lenti, M, Martelli, F, Veltri, M, Becker, HG, Eppard, K, Eppard, M, Fox, H, Kalter, A, Kleinknecht, K, Koch, U, Köpke, L, Lopes da Silva, P, Marouelli, P, Pellmann, I, Peters, A, Renk, B, Schmidt, SA, Schönharting, V, Schué, 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, Bertanza, L, Carosi, 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, Granier de Cassagnac, R, Mazzucato, E, Peyaud, B, Turlay, R, Vallage, B, Holder, M, Maier, A, Ziolkowski, M, Arcidiacono, R, Biino, C, Cartiglia, N, Guida, R, Marchetto, F, Menichetti, E, Pastrone, N, Nassalski, J, Rondio, E, Szleper, M, Wislicki, W, Wronka, S, Dibon, H, Fischer, G, Jeitler, M, Markytan, M, Mikulec, I, Neuhofer, G, Pernicka, M, Taurok, A, and Widhalm, L
- Abstract
We present a measurement of the ratio of the decay rates Γ (KL → π+ π-) / Γ (KL → π± e∓ ν), denoted as ΓK 2 π / ΓK e 3. The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47 000 K2 π and five million Ke 3 decays, we find ΓK 2 π / ΓK e 3 = (4.835 ± 0.022stat . ± 0.016syst .) × 10-3. From this we derive the branching ratio of the CP violating decay KL → π+ π- and the CP violation parameter | η+ - |. Excluding the CP conserving direct photon emission component KL → π+ π- γ, we obtain the results BR (KL → π+ π-) = (1.941 ± 0.019) × 10-3 and | η+ - | = (2.223 ± 0.012) × 10-3. © 2006 Elsevier B.V. All rights reserved.
- Published
- 2007