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.

引用

页数：6

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