Measurement of the decay K→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,Daniel 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

PHYSICS LETTERS B（1998）

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摘要

The full data set of the NA31 experiment at CERN has been used to analyse the decay mode K-L(0) --> e(+)e(-) gamma gamma. 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 +/- 0.1(stat)).10(9). This corresponds to a branching ratio of (8.0 +/- 1.5(-1.2)(+1.4)).10(-7). (C) 1998 Published by Elsevier Science B.V.

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