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

共 50 条

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Chao, Y
Chang, P
Abe, K
Abe, K
Abe, N
Adachi, I
Aihara, H
Akai, K
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Akemoto, M
Asano, Y
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Bakich, AM
Ban, Y
Barbero, M
Bay, A
Bedny, I
Bitenc, U
Bizjak, I
Blyth, S
Bondar, A
Bozek, A
Bracko, M
Brodzicka, J
Browder, TE
Chang, MC
Chen, A
Chen, KF
Chen, WT
Cheon, BG
Chistov, R
Choi, SK
Choi, Y
Choi, YK
Chuvikov, A
Cole, S
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Dash, M
Dong, LY
Dowd, R
Dragic, J
Drutskoy, A
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PHYSICAL REVIEW LETTERS, 2004, 93 (19) : 191802 - 1
[2] Observation of direct CP violation in B0→π+π- decays and model-independent constraints on the quark-mixing angle φ2
Ishino, H.
Abe, K.
Abe, K.
Adachi, I.
Aihara, H.
Anipko, D.
Arinstein, K.
Aushev, T.
Bakich, A. M.
Barberio, E.
Barbero, M.
Bedny, I.
Bitenc, U.
Bizjak, I.
Blyth, S.
Bozek, A.
Bracko, M.
Browder, T. E.
Chang, M.-C.
Chang, P.
Chao, Y.
Chen, A.
Chen, K.-F.
Chen, W. T.
Cheon, B. G.
Chistov, R.
Choi, Y.
Choi, Y. K.
Cole, S.
Dalseno, J.
Dash, M.
Drutskoy, A.
Eidelman, S.
Fratina, S.
Gershon, T.
Go, A.
Gokhroo, G.
Golob, B.
Gorisek, A.
Ha, H.
Haba, J.
Hara, K.
Hayasaka, K.
Hazumi, M.
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Hokuue, T.
Hoshi, Y.
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PHYSICAL REVIEW LETTERS, 2007, 98 (21)
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Abe, K
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Asano, Y
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Bakich, AM
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Bedny, I
Bizjak, I
Bondar, A
Bozek, A
Bracko, M
Browder, TE
Chao, Y
Chen, KF
Cheon, BG
Chistov, R
Choi, SK
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[4] Evidence for CP-violating asymmetries in B0→π+π- decays and constraints on the CKM angle φ2 -: art. no. 012001
Abe, K
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Asano, Y
Aushev, T
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PHYSICAL REVIEW D, 2003, 68 (01)
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[8] A new implication for strong interactions if large, direct CP violation in B0(B0)→π+π- is confirmed -: art. no. 004
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