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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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