e-Article
A precise measurement of the direct CP violation parameter Re(ε′/ε)
Document Type
article
Author
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-Dönszelmann, T; Cundy, D; D'Agostini, G; Doble, N; Falaleev, V; Funk, W; Gatignon, L; Gonidec, A; Gorini, B; Govi, G; Grafström, P; Kubischta, W; Lacourt, A; Lenti, M; Luitz, S; Matheys, JP; Mikulec, I; Norton, A; Palestini, S; Panzer-Steindel, B; Schinzel, D; Tatishvili, G; Taureg, H; Velasco, M; Vossnack, O; Wahl, H; Cheshkov, C; Gaponenko, A; Hristov, P; Kekelidze, V; Madigojine, D; Molokanova, N; Potrebenikov, Y; Tkatchev, A; Zinchenko, A; Knowles, I; Martin, V; Parsons, H; Sacco, R; Walker, A; Contalbrigo, M; Dalpiaz, P; Duclos, J; Frabetti, PL; Gianoli, A; Martini, M; Petrucci, F; Savrié, M; Scarpa, M; Bizzeti, A; Calvetti, M; Collazuol, G; Graziani, G; Iacopini, E; Martelli, F; Veltri, M; Becker, HG; Blümer, H; Coward, D; Eppard, M; Fox, H; Hirstius, A; Holtz, K; Kalter, A; Kleinknecht, K; Koch, U; Köpke, L; Lopes da Silva, P; Marouelli, P; Pellmann, I; Peters, A; Schmidt, SA; Schönharting, V; Schué, Y; Wanke, R; Winhart, A; Wittgen, M; Chollet, JC; Crépé, S; Fayard, L; Iconomidou-Fayard, L; Ocariz, J; Unal, G
Source
European Physical Journal C. 22(2)
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Language
Abstract
The direct CP violation parameter Re(ε′/ε) has been measured from the decay rates of neutral kaons into two pions using the NA48 detector at the CERN SPS. With 3.3 million KL → π0π0 events collected during the 1998 and 1999 running periods, a result of Re(ε′/ε) = (15.0 ± 2.7) × 10-4 has been obtained. The result combined with the published 1997 sample is Re(ε′/ε) = (15.3 ± 2.6) × 10-4.