Improved evidence for direct CP violation in B0→π+π- decays and model-independent constraints on φ2 -: art. no. 101801

被引：28
|
作者：
Abe, K [1 ]
Adachi, I
Aihara, H
Arinstein, K
Asano, Y
Aushev, T
Bakich, AM
Ban, Y
Barberio, E
Barbero, M
Bay, A
Bitenc, U
Bizjak, I
Blyth, S
Bondar, A
Bozek, A
Bracko, M
Brodzicka, J
Browder, TE
Chang, P
Chao, Y
Chen, A
Chen, KF
Chen, WT
Cheon, BG
Chistov, R
Choi, SK
Choi, Y
Choi, YK
Chuvikov, A
Cole, S
Dalseno, J
Dash, M
Dong, LY
Drutskoy, A
Eidelman, S
Enari, Y
Fang, F
Fratina, S
Gabyshev, N
Garmash, A
Gershon, T
Gokhroo, G
Golob, B
Gorisek, A
Haba, J
Hara, K
Hara, T
Hastings, NC
Hayashii, H
机构：
[1] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki, Japan
[2] Budker Inst Nucl Phys, Novosibirsk 630090, Russia
[3] Chiba Univ, Chiba, Japan
[4] Chonnam Natl Univ, Kwangju, South Korea
[5] Univ Cincinnati, Cincinnati, OH 45221 USA
[6] Gyeongsang Natl Univ, Chinju, South Korea
[7] Univ Hawaii, Honolulu, HI 96822 USA
[8] Hiroshima Inst Technol, Hiroshima, Japan
[9] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China
[10] Inst High Energy Phys, Vienna, Austria
[11] Inst Theoret & Expt Phys, Moscow, Russia
[12] Jozef Stefan Inst, Ljubljana, Slovenia
[13] Kanagawa Univ, Yokohama, Kanagawa, Japan
[14] Korea Univ, Seoul 136701, South Korea
[15] Kyungpook Natl Univ, Taegu 702701, South Korea
[16] Swiss Fed Inst Technol, EPFL, CH-1015 Lausanne, Switzerland
[17] Univ Ljubljana, Ljubljana, Slovenia
[18] Univ Maribor, SLO-2000 Maribor, Slovenia
[19] Univ Melbourne, Parkville, Vic 3052, Australia
[20] Nagoya Univ, Nagoya, Aichi, Japan
[21] Nara Womens Univ, Nara 630, Japan
[22] Natl Cent Univ, Chungli 32054, Taiwan
[23] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan
[24] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
[25] Nippon Dent Univ, Niigata, Japan
[26] Niigata Univ, Niigata, Japan
[27] Osaka City Univ, Osaka 558, Japan
[28] Osaka Univ, Osaka, Japan
[29] Panjab Univ, Chandigarh 160014, India
[30] Peking Univ, Beijing 100871, Peoples R China
[31] Princeton Univ, Princeton, NJ 08544 USA
[32] Saga Univ, Saga 840, Japan
[33] Univ Sci & Technol China, Hefei 230026, Peoples R China
[34] Seoul Natl Univ, Seoul, South Korea
[35] Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea
[36] Univ Sydney, Sydney, NSW 2006, Australia
[37] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
[38] Toho Univ, Funabashi, Chiba 274, Japan
[39] Tohoku Gakuin Univ, Tagajo, Miyagi, Japan
[40] Tohoku Univ, Sendai, Miyagi 980, Japan
[41] Univ Tokyo, Dept Phys, Tokyo 113, Japan
[42] Tokyo Inst Technol, Tokyo 152, Japan
[43] Tokyo Metropolitan Univ, Tokyo 158, Japan
[44] Tokyo Univ Agr & Technol, Tokyo, Japan
[45] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan
[46] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
[47] Yonsei Univ, Seoul 120749, South Korea
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 10期
关键词：
D O I：
10.1103/PhysRevLett.95.101801
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present a new measurement of the time-dependent CP-violating parameters in B-0 ->pi(+)pi(-) decays with 275x10(6) B (B) over bar pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider operating at the Upsilon(4S) resonance. We find 666 +/- 43 B-0 ->pi(+)pi(-) events and measure the CP-violating parameters: S-pi pi=-0.67 +/- 0.16(stat)+/- 0.06(syst) and A(pi pi)=+0.56 +/- 0.12(stat)+/- 0.06(syst). We find evidence for large direct CP violation with a significance greater than 4 standard deviations for any S-pi pi value. Using isospin relations, we obtain 95.4% confidence intervals for the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle phi(2) of 0 degrees <phi(2)< 19 degrees and 71 degrees <phi(2)< 180 degrees.
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页数：6
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