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

  • Author(s): Barr, GD;
  • Buchholz, P;
  • Carosi, R;
  • Coward, D;
  • Cundy, D;
  • Doble, N;
  • Gatignon, L;
  • Gibson, V;
  • Grafström, P;
  • Hagelberg, R;
  • van der Lans, J;
  • Nelson, HN;
  • Wahl, H;
  • Peach, KJ;
  • Blümer, H;
  • Heinz, R;
  • Kleinknecht, K;
  • Mayer, P;
  • Panzer, B;
  • Renk, B;
  • Rohrer, H;
  • Sander, HG;
  • Wagner, A;
  • Augé, E;
  • Fournier, D;
  • Heusse, P;
  • Iconomidou-Fayard, L;
  • Harrus, I;
  • Perdereau, O;
  • Schaffer, AC;
  • Serin, L;
  • Bertanza, L;
  • Bigi, A;
  • Calafiura, P;
  • Calvetti, M;
  • Carrozza, MC;
  • Casali, R;
  • Cerri, C;
  • Fantechi, R;
  • Mannelli, IG;
  • Marzulli, VM;
  • Nappi, A;
  • Pierazzini, G;
  • Holder, M;
  • Kreutz, A;
  • Quast, G;
  • Rost, M;
  • Werthenbach, R;
  • Zech, G
  • et al.
Abstract

A new measurement of the ratio of the CP-violating amplitudes for KL → 2π0 and KL → π+π- is reported. The measured value for R = {divides}η00/η+-{divides}2 is 0.9878±0.0026±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 ε{lunate}'/ε{lunate} = (2.0 ± 0.7) × 10-3. © 1993.

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