Upper limit for the branching ratio of K-s->e(+)e(-) decay

R Adler,T Alhalel,A Angelopoulos, A Apostolakis, E Aslanides, G Backenstoss,P Bargassa,CP Bee,O Behnke,A Benelli,V Bertin,F Blanc, P Bloch,P Carlson,M Carroll,J Carvalho,E Cawley,S Charalambous,G Chardin,MB Chertok,A Cody,M Danielsson,M Dejardin, J Derre,A Ealet,B Eckart,C Eleftheriadis,I Evangelou,L Faravel, P Fassnacht, C Felder,R FerreiraMarques,W Fetscher,M Fidecaro,A Filipcic,D Francis,J Fry, E Gabathuler, R Gamet, D Garreta,HJ Gerber,A Go, C Guyot,A Haselden,PJ Hayman,F HenryCouannier,RW Hollander,E Hubert,K JonAnd,PR Kettle,C Kochowski,P Kokkas,R Kreuger,R LeGac,F Leimgruber,A Liolios,E Machado, I Mandic,N Manthos,G Marel,M Mikuz,J Miller,F Montanet,T Nakada,B Pagels,I Papadopoulos,P Pavlopoulos,JP daCunha, A Policarpo,G Polivka,R Rickenbach,BL Roberts,T Ruf,L Sakeliou,P Sanders,C Santoni,M Schafer,LA Schaller,T Schietinger,A Schopper,P Schune,A Soares, L Tauscher,C Thibault,F Touchard,C Touramanis,F Triantis,E VanBeveren,CWE VanEijk,S Vlachos, P Weber,O Wigger,M Wolter,C Yeche,D Zavrtanik,D Zimmerman

The seventh international conference on hadron spectroscopy（1997）

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摘要

A measurement of the branching ratio for K-s --> e(+)e(-) decay was performed with the CPLEAR detector at LEAR. Full event reconstruction together with calorimeter e/pi separation allowed for powerful background rejection and high signal acceptance. Analysis of data taken up to 1994 yields the result: Br(K-s --> e(+)e(-)) < 4.2.10(-7) (90% CL).

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