A new measurement of direct CP violation in the neutral kaon system

A new measurement of the ratio of the CP-violating amplitudes for $K_{L} \to 2\pi^{0}$ and $K_{L} \to \pi^{+}\pi^{-}$ is reported. The measured value for $\Re = |\eta_{00} / \eta_{ +-}|^{2}$ is $0.9878 \pm 0.0026 \pm 0.0030$, where the first error is the statistical uncertainty and the second is the...

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Detalles Bibliográficos
Autores principales: Barr, Giles David, Buchholz, P, Carosi, R, Coward, D H, Cundy, Donald C, Doble, Niels T, Gatignon, L, Gibson, V, Grafström, P, Hagelberg, R, Van der Lans, J, Nelson, H N, Wahl, H, Peach, Kenneth J, Blümer, H, Heinz, R, Kleinknecht, K, Mayer, P, Panzer, B, Renk, B, Rohrer, H, Sander, H G, Wagner, A, Augé, E, Fournier, D, Heusse, P, Iconomidou-Fayard, L, Harrus, I, Perdereau, O, Schaffer, A C, Serin, L, Bertanza, L, Bigi, A, Calafiura, P, Calvetti, M, Carrozza, M C, Casali, R, Cerri, C, Fantechi, R, Mannelli, I G, Marzulli, V M, Nappi, A, Pierazzini, G M, Holder, M, Kreutz, A, Quast, G, Rost, M, Werthenbach, R, Zech, G
Lenguaje:eng
Publicado: 1993
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(93)91599-I
http://cds.cern.ch/record/253618
Descripción
Sumario:A new measurement of the ratio of the CP-violating amplitudes for $K_{L} \to 2\pi^{0}$ and $K_{L} \to \pi^{+}\pi^{-}$ is reported. The measured value for $\Re = |\eta_{00} / \eta_{ +-}|^{2}$ is $0.9878 \pm 0.0026 \pm 0.0030$, where the first error is the statistical uncertainty and the second is the estimate of the systematic uncertainty. This gives a value for the parameter describing direct CP violation: $\Re$ $\epsilon'/\epsilon = (2.0 \pm 0.7) \times 10^{−3}$ .

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