1. Measurement of the branching ratio of the double Dalitz decayK L →e+e−e+e− and the CP parity of theK L -meson
- Author
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O. Perdereau, Arthur Schaffer, D. Coward, G.M. Pierazzini, Ken Peach, M. Holder, P. Grafström, A. Kreutz, Konrad Kleinknecht, L. Gatignon, R. Casali, R. Carosi, Daniel Fournier, H. Rohrer, G.D. Barr, R. Heinz, I. Mannelli, Lydia Iconomidou-Fayard, R. Hagelberg, A. Wagner, L. Bertanza, H. G. Sander, D.C. Cundy, A. Nappi, J. Scheidt, M. Calvetti, F. Leber, M. Rost, H. D. Wahl, Laurent Serin, B. Renk, J. Staeck, V.M. Marzulli, T. Beier, Paolo Calafiura, Peter Buchholz, N. Doble, C. Cerri, H. Blümer, R. Werthenbach, E. Augé, and P. Mayer
- Subjects
Physics ,Particle physics ,Large Hadron Collider ,Physics and Astronomy (miscellaneous) ,Meson ,Branching fraction ,Nuclear Theory ,Parity (physics) ,Elementary particle ,Nuclear physics ,High Energy Physics::Experiment ,Quantum field theory ,Nuclear Experiment ,Engineering (miscellaneous) - Abstract
Data from the NA31 experiment at CERN have been used to measure the branching ratio of the double Dalitz decay of the long-lived neutral kaon. Eight events have been found with negligible background. The measured distribution of the angle between the planes of the two e+e--pairs favours a CP=-1 state for the long-lived neutral kaon. © 1995 Springer-Verlag.
- Published
- 1995