Upper limit for the branching ratio of K S → e +e − decay

R Adler ,D Zimmerman,L Sakeliou,L Faravel,P Pavlopoulos,T Alhalel,G Polivka,P Carlson,O Wigger,G Chardin,P Bloch,B Pagels,A Schopper,A Liolios,A Go,F Blanc,G Backenstoss,I Mandié,C Kochowski,R Gamet,A Benelli,A Angelopoulos,G Marel,A Apostolakis,P Sanders,D Garreta,T Ruf,C Thibault,A Haselden,R.W Hollander,L Tauscher,R Le Gac,E Hubert,O Behnke,W Fetscher,E Cawley,B Eckart,E Gabathuler,J Pinto Da Cunha,R Kreuger,R Rickenbach,C.W.E Van Eijk,M Fidecaro,E Machado,T Schietinger,A Ealet,C Touramanis,C Felder,F Leimgruber,C Eleftheriadis,Eef Van Beveren ,C Yèche ,P Bargassa ,F A Triantis ,D Francis ,M Chertok ,Ann Marie Cody ,V Bertín ,I Papadopoulos ,T Nakada ,P Kokkas ,M W Wolter ,J Carvalho ,M Carroll ,F Touchard ,P Fassnacht ,P Hayman ,H.‐J Gerber ,M Schäfer ,J Miller ,F Montanet ,P R Kettle ,S Charalambous ,C Santoni ,B L Roberts ,C Guyot ,A Policarpo ,M Déjardin ,A Filipčǐc ,Ph Schune ,Mats Danielsson ,L.a Schaller ,Peter M Weber ,E Aslanides ,M Mikü ,J R Fry ,D Zavrtanik ,S Vlachos ,I Evangelou ,J Derré ,C P Bee ,R Ferreira‐Marques ,N Manthos ,A Soares ,K Jon‐And ,F Henry‐Couannier

doi:10.1016/s0920-5632(97)00271-5

Upper limit for the branching ratio of K S → e +e − decay

R Adler , D Zimmerman + Show 94 more

https://doi.org/10.1016/s0920-5632(97)00271-5

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Journal: Nuclear Physics B (Proceedings Supplements)

Publication Date: Jun 1, 1997

Affiliation: Atomic Energy and Alternative Energies Commission, CEA Saclay, Tekniska Högskolans Studentkår, Aix-Marseille University, French National Centre for Scientific Research, Boston University, European Organization for Nuclear Research, Aristotle University of Thessaloniki, Royal Institute of Technology, University of Fribourg, University of Liverpool, National and Kapodistrian University of Athens, Delft University of Technology, ETH Zurich, University of Coimbra

#Full Event Reconstruction #Branching Ratio + Show 8 more

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Abstract

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/π 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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