Measurement of Time-dependent CP Asymmetries in B^0 --> K^0_s K^0_s K^0_s Decays

B. Aubert,R Barate,M Bona, D Boutigny, F Couderc,Y Karyotakis,J P Lees,V Poireau,V Tisserand,A Zghiche,E Grauges,A Palano, Jen Chi Chen,N D Qi,G Rong,Pei Wang,Y S Zhu,G Eigen,I Ofte, B Stugu,G S Abrams,M Battaglia,J Buttonshafer,R N Cahn, E Charles,M S Gill,Y Groysman,R G Jacobsen,J Kadyk,L T Kerth,Yu G Kolomensky, G Kukartsev,G Lynch,L M Mir, T J Orimoto,M Pripstein,N A Roe,M T Ronan,W A Wenzel,Amosanchez P Del,M Barrett,K E Ford,A J Hart,T J Harrison,C M Hawkes,S E Morgan,A T Watson,T Held,H Koch,B Lewandowski,M Pelizaeus,K Peters,T Schroeder, M Steinke, J T Boyd,J P Burke,W N Cottingham,David Walker,D J Asgeirsson,T Cuhadardonszelmann,B G Fulsom,C Hearty,N S Knecht,T S Mattison,J A Mckenna, A R Khan, P Kyberd,M Saleem,D J Sherwood,L Teodorescu,V E Blinov,A D Bukin,V P Druzhinin,V B Golubev,A P Onuchin,S I Serednyakov,Yu I Skovpen,E P Solodov, Y K Todyshev,D Best,M Bondioli,M Bruinsma,M Chao,S Curry,I Eschrich,D Kirkby,A J Lankford,P Lund,M Mandelkern,E C Martin,R K Mommsen,W Rothel,D P 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Ritchie, A Satpathy,C J Schilling,R F Schwitters, J M Izen,X C Lou, S Ye,F Bianchi,F Gallo,D Gamba, M Bomben,L Bosisio,C Cartaro, F Cossutti,Ricca G Della,S Dittongo,L Lanceri,L Vitale, V Azzolini,N Lopezmarch,F Martinezvidal,Sw Banerjee,B Bhuyan,C M Brown,D Fortin,K Hamano, R Kowalewski, I M Nugent, J M Roney, R Sobie,J J Back, P F Harrison,T E Latham, G B Mohanty,M Pappagallo, H R Band,B Cheng, S Dasu,M Datta,K T Flood,Jonathan Hollar,P E Kutter,B Mellado,A Mihalyi, Y Pan,M Pierini,R Prepost,Sau Lan Wu, Zhengyuan Yu, H A Neal,BABAR Collaboration

mag（2006）

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摘要

We present preliminary measurements of the CP asymmetry parameters in B^0 -> K^0_S K^0_S K^0_S decays, reconstructing two of the K^0_S into pi^+pi^- and one into pi^0pi^0. In a sample of 227M $B\bar B$ pairs collected by the BABAR detector at the PEP-II B-Factory at SLAC, we find the CP parameters to be S = -0.25^{+0.68}_{-0.61} (stat) +/- 0.05 (syst) and C = 0.56^{+0.34}_{-0.43} (stat) +/- 0.04 (syst). Combining this result with the previous BABAR measurement, obtained from events with three K^0_S decaying into pi^+pi^-, we get S = -0.63^{+0.32}_{-0.28} (stat) +/- 0.04(syst) C = -0.10 +/- 0.25 (stat) +/- 0.05 (syst)

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high energy physics,particle accelerators,cp violation,asymmetry

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