Improved measurement of time-dependent CP violation in B0→J/ψπ0 decays

S. E. Lee,K. Miyabayashi,H. Aihara,T. Aushev,T. Aziz,A. M. Bakich,V. Balagura,E. Barberio, A. Bay,K. Belous,V. Bhardwaj,U. Bitenc,S. Blyth,A. Bondar,A. Bozek,K. Sumisawa,T. Sumiyoshi,S. Suzuki,O. Tajima,F. Takasaki,K. Tamai, M. Tanaka,G. N. Taylor,Y. Teramoto,I. Tikhomirov,K. Trabelsi,S. Uehara,K. Ueno,T. Uglov, Y. Unno,S. Uno, P. Urquijo,Y. Ushiroda,Y. Usov, G. Varner,K. E. Varvell,S. Villa,C. C. Wang,C. H. Wang,P. Wang,X. L. Wang,Y. Watanabe,E. Won,A. Yamaguchi, Y. Yamashita,M. Yamauchi, C. Z. Yuan,Y. Yusa,C. C. Zhang,Z. P. Zhang,V. Zhilich,V. Zhulanov, A. Zupanc,S. Kim,Y. Kim,K. Kinoshita,S. Korpar,P. Križan,R. Kumar,C. Kuo,A. Kuzmin,Y.-J. Kwon,J. Lee,M. Lee,T. Lesiak,S.-W. Lin,Y. Liu,D. Liventsev,S. McOnie,T. Medvedeva,W. Mitaroff,H. Miyata,R. Mizuk, T. Mori,E. Nakano, M. Nakao,H. Nakazawa,Z. Natkaniec,S. Nishida,O. Nitoh,S. Noguchi,T. Nozaki,S. Ogawa,T. Ohshima,S. Okuno,S. Olsen,H. Ozaki,P. Pakhlov,G. Pakhlova,H. Park,K. Park,R. Pestotnik,L. Piilonen,H. Sahoo, Y. Sakai,O. Schneider,A. Schwartz,A. Sekiya,K. Senyo,M. Shapkin,C. Shen,H. Shibuya,S. Shinomiya, J.-G. Shiu,B. Shwartz, J. Singh,A. Sokolov,A. Somov,S. Stanič,M. Starič,K. Sumisawa,T. Sumiyoshi,S. Suzuki,O. Tajima,F. Takasaki,K. Tamai, M. Tanaka,G. Taylor,Y. Teramoto,I. Tikhomirov,K. Trabelsi,S. Uehara,K. Ueno,T. Uglov, Y. Unno,S. Uno, P. Urquijo,Y. Ushiroda,Y. Usov, G. Varner,K. Varvell,S. Villa,C. Wang,P. Wang,X. Wang,Y. Watanabe,E. Won,A. Yamaguchi, Y. Yamashita,M. Yamauchi, C. Yuan,Y. Yusa,C. Zhang,Z. Zhang,V. Zhilich,V. Zhulanov, A. Zupanc

PHYSICAL REVIEW D（2008）

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摘要

We report improved measurements of time-dependent CP violation parameters for B-0((B) over bar (0))-> J/psi pi(0) decay. This analysis is based on 535x10(6) B (B) over bar pairs accumulated at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. From the distribution of proper time intervals between the two B decays, we obtain the following CP violation parameters S-J/psi pi(0)=-0.65 +/- 0.21(stat)+/- 0.05(syst) and A(J/psi pi)(0)=+0.08 +/- 0.16(stat)+/- 0.05(syst),which are consistent with standard model expectations.

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关键词

elementary particles,cp violation,standard model

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