Observation of time-dependent CP violation in B0→η′K0 decays and improved measurements of CP asymmetries in B0→φK0, KS0KS0KS0 and B0→J/ψK0 decays

被引：116

作者：

Chen, K. -F. ^{[1
]}

Hara, K.

Hazumi, M.

Higuchi, T.

Miyabayashi, K.

Nakahama, Y.

Sumisawa, K.

Tajima, O.

Ushiroda, Y.

Yusa, Y.

Abe, K.

Adachi, I.

Aihara, H.

Anipko, D.

Arinstein, K.

Aulchenko, V.

Aushev, T.

Aziz, T.

Bakich, A. M.

Balagura, V.

Banerjee, S.

Barberio, E.

Barbero, M.

Bay, A.

Belous, K.

Bitenc, U.

Bizjak, I.

Blyth, S.

Bondar, A.

Bozek, A.

Bracko, M.

Brodzicka, J.

Browder, T. E.

Chang, P.

Chao, Y.

Chen, A.

Chen, W. T.

Cheon, B. G.

Chistov, R.

Choi, S. -K.

Choi, Y.

Choi, Y. K.

Chuvikov, A.

Cole, S.

Dalseno, J.

Danilov, M.

Dash, M.

Dragic, J.

Drutskoy, A.

机构：

[1] Natl Taiwan Univ, Dept Phys, Taipei 10764, Taiwan

[2] Natl United Univ, Miaoli, Taiwan

[3] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[4] Nippon Dent Univ, Niigata, Japan

[5] Niigata Univ, Niigata, Japan

[6] Osaka City Univ, Osaka 558, Japan

[7] Osaka Univ, Osaka, Japan

[8] Panjab Univ, Chandigarh 160014, India

[9] Peking Univ, Beijing 100871, Peoples R China

[10] Princeton Univ, Princeton, NJ 08544 USA

[11] Brookhaven Natl Lab, Res Ctr, RIKEN, Upton, NY 11973 USA

[12] Saga Univ, Saga 840, Japan

[13] Univ Sci & Technol China, Hefei 230026, Peoples R China

[14] Seoul Natl Univ, Seoul, South Korea

[15] Shinshu Univ, Nagano, Japan

[16] Sungkyunkwan Univ, Suwon 440746, South Korea

[17] Univ Sydney, Sydney, NSW 2006, Australia

[18] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[19] Toho Univ, Funabashi, Chiba 274, Japan

[20] Tohoku Gakuin Univ, Tagajo, Miyagi 985, Japan

[21] Tohoku Univ, Sendai, Miyagi 980, Japan

[22] Univ Tokyo, Dept Phys, Tokyo, Japan

[23] Tokyo Inst Technol, Tokyo, Japan

[24] Tokyo Metropolitan Univ, Tokyo 158, Japan

[25] Tokyo Univ Agr & Technol, Tokyo, Japan

[26] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[27] Yonsei Univ, Seoul, South Korea

[28] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[29] Chiba Univ, Chiba, Japan

[30] Chonnam Natl Univ, Kwangju 500757, South Korea

[31] Univ Cincinnati, Cincinnati, OH 45221 USA

[32] Grad Univ Adv Studies, Hayama, Japan

[33] Gyeongsang Natl Univ, Chinju, South Korea

[34] Univ Hawaii, Honolulu, HI 96822 USA

[35] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

[36] Hiroshima Inst Technol, Hiroshima, Japan

[37] Univ Illinois, Urbana, IL 61801 USA

[38] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[39] Inst High Energy Phys, Vienna, Austria

[40] Inst High Energy Phys, Protvino, Russia

[41] Inst Theoret & Expt Phys, Moscow 117259, Russia

[42] Jozef Stefan Inst, Ljubljana, Slovenia

[43] Kanagawa Univ, Yokohama, Kanagawa, Japan

[44] Korea Univ, Seoul 136701, South Korea

[45] Kyungpook Natl Univ, Taegu 702701, South Korea

[46] Swiss Fed Inst Technol, EPFL, Lausanne, Switzerland

[47] Univ Ljubljana, Ljubljana, Slovenia

[48] Univ Maribor, SLO-2000 Maribor, Slovenia

[49] Univ Melbourne, Melbourne, Vic, Australia

[50] Nagoya Univ, Nagoya, Aichi, Japan

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.98.031802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present improved measurements of CP-violation parameters in B-0 -> phi K-0, eta K-'(0), (KSKSKS0)-K-0-K-0 decays based on a sample of 535 x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We obtain sin2 phi(eff)(1) = +0.64 +/- 0.10(stat) +/- 0.04(syst) for B-0 -> eta K-'(0), +0.50 +/- 0.21(stat) +/- 0.06(syst) for B-0 ->phi K-0, and +0.30 +/- 0.32(stat) +/- 0.08(syst) for B-0 -> (KSKSKS0)-K-0-K-0 decays. We have observed CP violation in the B-0 -> eta K-'(0) decay with a significance of 5.6 standard deviations. We also perform an improved measurement of CP asymmetries in B-0 -> J/psi K-0 decays and obtain sin2 phi(1) = +0.642 +/- 0.031(stat) +/- 0.017(syst).

引用

页数：6

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