Measurement of the decay K L → e + e − γγ

M G Setzu, A Nappi, A Beisser,T Beier,H Blumer,P Buchholz, D H Coward,Konrad Kleinknecht,F Leber, B Renk,H Rohrer,H G Sander,F Scheerer,J Scheidt, J Staeck,Anja Wagner,G Barr,D Cundy,N Doble,L Gatignon, P Grafstrom,R Hagelberg,H Wahl, K J Peach, E Auge,D Fournier,L Iconomidoufayard,O Perdereau, A C Schaffer, L Serin,L Bertanza, A Bigi,P Calafiura,M Calvetti,R Carosi,R Casali, R Fantechi, I Mannelli,V M Marzulli, G M Pierazzini, M Holder,A Kreutz, R Werthenbach

Fuel and Energy Abstracts（1998）

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Abstract

Abstract The full data set of the NA31 experiment at CERN has been used to analyse the decay mode K0L→e+e−γγ. A signal of 47 events has been observed with an estimated background of 6.9 events. The total number of kaon decays in the decay volume was determined to be (2.1±0.1stat)·109. This corresponds to a branching ratio of 8.0±1.5 +1.4 −1.2 ·10 −7 .

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decay

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