Measurement of the branching ratio of the double Dalitz decayK L →e+e−e+e− and the CP parity of theK L -meson

G. D. Barr, P. Buchholz,D. Cundy,N. Doble,L. Gatignon,P. Grafström,R. Hagelberg,H. Wahl,K. J. Peach,T. Beier,H. Blümer,D. Coward,R. Heinz, K. Kleinknecht,F. Leber,P. Mayer,B. Renk,H. Rohrer,H. G. Sander,J. Scheidt,J. Staeck, A. Wagner,E. Augé,D. Fournier,L. Iconomidou-Fayard,O. Perdereau, A. C. Schaffer, L. Serin,L. Bertanza, P. Calafiura,M. Calvetti,R. Carosi,R. Casali,C. Cerri,I. Mannelli,V. M. Marzulli, A. Nappi,G. M. Pierazzini, M. Holder,A. Kreutz,M. Rost,R. Werthenbach

European Physical Journal C（1995）

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摘要

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 aCP=−1 state for the long-lived neutral kaon.

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关键词

Field Theory, Elementary Particle, Quantum Field Theory, Particle Acceleration, Measured Distribution

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