Measurement of the CP violation parameter η+− using tagged K 0 and [formula omitted

R Adler,G Backenstoss,C Santoni,E Cawley,G Polivka,C Felder,M Mikuž,L Tauscher,R Kreuger,A Ealet,H Postma,E Hubert,S Charalambous,A Onofre,L Faravel,J Bennet,M Chardalas,L.A Schaller,L Sakeliou,T Schietinger,J Pinto Da Cunha,A Benelli,D Francis,E Gabathuler,B Eckart,L Sacks,M Dodgson,H.U Johner,P Fassnacht,T Lawry,R Gamet,C Kochowski,E Machado,G Policarpo,F Blanc,P Pavlopoulos,P Sanders,C Eleftheriadis,R Le Gac,F Montanet,D Zimmerman,C Bula,I Papadopoulos,W.G Heyes,M Schäfer,A Haselden,G Varner,F Leimgruber,J Carvalho,B Pagels,C Fuglesang,N Manthos,E Aslanides,P Carlson,D Zavrtanik,A Liolios,E Rozaki,T Ruf,O Behnke,R Rickenbach,A Go,P Kokkas,P Maley,S Vlachos,C Guyot,S Dedoussis,A Apostolakis,J Miller,W Fetscher,J Duclos,C.W.E Van Eijk,G Chardin,A Angelopoulos,G Marel,D Gamet,O Wigger,T Nakada,T Geralis,A Schopper,C Witzig,T Alhalel,C Touramanis,M Fidecaro,M Carroll,P Gumplinger,K Sarigiannis,F Touchard,F Pelucchi,P Bloch,A Soares,R.W Hollander,I Evangelou,C Thibault,D Garreta,A Filipčǐc ,H.j Gerber ,C P Bee ,F A Triantis ,J Derré ,V Bertín ,Peter M Weber ,P Hayman ,P F Harrison ,K Jon‐And ,F Henry‐Couannier ,J K Bienlein ,Mats Danielsson ,Kjell Jansson ,R Ferreira‐Marques ,Ann Marie Cody ,J L Faure ,M Déjardin ,J R Fry ,Eef Van Beveren ,M Chertok ,Ph Schune ,Ch Yèche ,M W Wolter ,D Tröster ,B L Roberts ,I Mandić ,P.r Kettle

doi:10.1016/0370-2693(95)01295-0

Abstract

The CP violation parameter η +− is determined through the eigentime-dependent asymmetry in the rates of initially tagged K 0 and K 0 decaying to π + π −. The obtained values are | η +−| = (2.312 ± 0.043 stat. ± 0.030 syst. ± 0.011 τs) × 10 −3 and Φ +− = 42.7° ± 0.9 stat.° ± 0.6 syst.° ± 0.9 Δm ° with Δ = (527.4 ± 2.9) × 10 7 h ̵ gs −1 measured in the same experiment using the semileptonic decay channel.

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