• A new measurement of direct CP violation in the neutral kaon system
    with G. D. Barr, P. Buchholz, R. Carosi, D. Coward, D. Cundy, N. Doble, L. Gatignon, V. Gibson, P. Grafström, R. Hagelberg, J. van der Lans, H. N. Nelson, H. Wahl, K. J. Peach, H. Blümer, R. Heinz, K. Kleinknecht, P. Mayer, B. Panzer, B. Renk, H. Rohrer, H. G. Sander, A. Wagner, E. Augé, D. Fournier, P. Heusse, L. Iconomidou-Fayard, I. Harrus, O. Perdereau, A. C. Schaffer, L. Serin, L. Bertanza, A. Bigi, P. Calafiura, M. Calvetti, M. C. Carrozza, R. Casali, C. Cerri, R. Fantechi, I. G. Mannelli, V. M. Marzulli, A. Nappi, G. Pierazzini, M. Holder, G. Quast, M. Rost, R. Werthenbach, and G. Zech
    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} = × 10-3. © 1993.