Measurement of η +− with the CPLEAR experiment

Robert F Adler,T Alhalel,A Angelopoulos,A Apostolakis,E Aslanides,G Backenstoss,P Bargassa,C P Bee,O Behnke,A Benelli,V Bertin,F Blanc, P Bloch, P Carlson,M Carroll,Jose F De Carvalho,E Cawley,S Charalambous,G Chardin, M Chertok,A Cody, M Danielsson, M Dejardin,J Derre,A Ealet,B Eckart,C Eleftheriadis,Ioannis Evangelou,L Faravel, P Fassnacht, C Felder,R Ferreiramarques,W Fetscher,M Fidecaro, A Filipcic,David J Francis,J R Fry, E Gabathuler,R Gamet, D Garreta,H J Gerber,A Go, C Guyot,A Haselden,P J Hayman,F Henrycouannier,R W Hollander,E Hubert,Kerstin Jonand,P R Kettle,C Kochowski,P Kokkas,R Kreuger,R Le Gac,F Leimgruber,A Liolios,E Machado, I Mandic,N Manthos,G Marel, M Miku,J S Miller,F Montanet,T Nakada,B Pagels,I Papadopoulos,P Pavlopoulos,J Pinto Da Cunha,A J P L Policarpo,G Polivka,R Rickenbach,B L Roberts,T Ruf,L Sakeliou,P Sanders, C Santoni,Mark E Schafer,L A Schaller,T Schietinger,A Schopper,Philippe Schune,A Soares, L Tauscher,C Thibault, F Touchard,C Touramanis, F A Triantis,E Van Beveren,C W E Van Eijk,S Vlachos, Pavel Weber,O Wigger,Marcin Wladyslaw Wolter,C Yeche,D Zavrtanik,Donald W Zimmerman

Nuclear Physics B-proceedings Supplements（1997）

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摘要

The CPLEAR experiment at CERN uses time-dependent decay-rate asymmetries between K 0 and K 0 to measure η +− . The analysis and the systematic errors are discussed. The preliminary results from all our data are φ +− = 43.5 0 ± 0.5 0 stat ± 0.5 syst ± 0.4 Δm and | η +−| = (2.316 ± 0.025 stat ± 0.028 syst ± 0.009 τ S ) × 10 −3 . The dominant part in the systematic error of φ +− is due to the regeneration correction. A dedicated experiment was performed to reduce this error considerably.

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关键词

decay rate,systematic error

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