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 22 条

[1] The Belle detector [J].

Abashian, A ;

Abe, K ;

Abe, R ;

Abe, K ;

Adachi, I ;

Ahn, BS ;

Ahn, HS ;

Aihara, H ;

Akatsu, M ;

Akhmetshin, R ;

Alexander, JP ;

Alimonti, G ;

An, Q ;

Aoki, K ;

Asai, M ;

Asano, Y ;

Aso, T ;

Aulchenko, V ;

Bakich, AM ;

Banas, E ;

Behari, S ;

Behera, PK ;

Beiline, D ;

Bondar, A ;

Bozek, A ;

Browder, TE ;

Casey, BCK ;

Chang, P ;

Chang, YH ;

Chao, Y ;

Chen, HS ;

Chen, HF ;

Chen, YQ ;

Cheon, BG ;

Chidzik, S ;

Choi, S ;

Choi, Y ;

Dneprovsky, L ;

Doi, Y ;

Dong, LY ;

Dragic, J ;

Drutskoy, A ;

Eidelman, S ;

Enomoto, R ;

Everton, CW ;

Fang, F ;

Fujii, H ;

Fujimoto, K ;

Fujita, Y ;

Fukunaga, C .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2002, 479 (01) :117-232

[2] Observation of large CP violation and evidence for direct CP violation in B0+p- decays -: art. no. 021601 [J].

Abe, K ;

Abe, N ;

Abe, T ;

Adachi, I ;

Aihara, H ;

Akai, K ;

Akatsu, M ;

Akemoto, M ;

Asano, Y ;

Aso, T ;

Aulchenko, V ;

Aushev, T ;

Bakich, AM ;

Ban, Y ;

Banerjee, S ;

Bay, A ;

Bedny, I ;

Bizjak, I ;

Bondar, A ;

Bozek, A ;

Bracko, M ;

Browder, TE ;

Chao, Y ;

Chen, KF ;

Cheon, BG ;

Chistov, R ;

Choi, SK ;

Choi, Y ;

Chuvikov, A ;

Cole, S ;

Danilov, M ;

Dragic, J ;

Drutskoy, A ;

Eidelman, S ;

Eiges, V ;

Enari, Y ;

Epifanov, D ;

Flanagan, J ;

Furukawa, K ;

Gabyshev, N ;

Garmash, A ;

Gershon, T ;

Golob, B ;

Haba, J ;

Hara, K ;

Hastings, NC ;

Hayashii, H ;

Hazumi, M ;

Hinz, L .

PHYSICAL REVIEW LETTERS, 2004, 93 (02) :021601-1

[3] SEARCH FOR HADRONIC B-]U DECAYS [J].

ALBRECHT, H ;

GLASER, R ;

HARDER, G ;

KRUGER, A ;

NILSSON, AW ;

NIPPE, A ;

OEST, T ;

REIDENBACH, M ;

SCHAFER, M ;

SCHMIDTPARZEFALL, W ;

SCHRODER, H ;

SCHULZ, HD ;

SEFKOW, F ;

WURTH, R ;

APPUHN, RD ;

DRESCHER, A ;

HAST, C ;

HERRERA, G ;

KOLANOSKI, H ;

LANGE, A ;

LINDNER, A ;

MANKEL, R ;

SCHECK, H ;

SCHWEDA, G ;

SPAAN, B ;

WALTHER, A ;

WEGENER, D ;

PAULINI, M ;

REIM, K ;

VOLLAND, U ;

WEGENER, H ;

FUNK, W ;

STIEWE, J ;

WERNER, S ;

BALL, S ;

GABRIEL, JC ;

GEYER, C ;

HOLSCHER, A ;

HOFMANN, W ;

HOLZER, B ;

KHAN, S ;

SPENGLER, J ;

CHARLESWORTH, CEK ;

EDWARDS, KW ;

FRISKEN, WR ;

KAPITZA, H ;

KRIEGER, P ;

KUTSCHKE, R ;

MACFARLANE, DB ;

MCLEAN, KW .

PHYSICS LETTERS B, 1990, 241 (02) :278-282

[4]

Alexander J., HEPEX0412073

[5]

AUBERT B, HEPEX0501071

[6] NOTES ON THE OBSERVABILITY OF CP-VIOLATIONS IN B-DECAYS [J].

BIGI, II ;

SANDA, AI .

NUCLEAR PHYSICS B, 1981, 193 (01) :85-108

[7] CP VIOLATION IN B-MESON DECAYS [J].

CARTER, AB ;

SANDA, AI .

PHYSICAL REVIEW D, 1981, 23 (07) :1567-1579

[8] Evidence for direct CP violation in B0→K+π- decays -: art. no. 191802 [J].

Chao, Y ;

Chang, P ;

Abe, K ;

Abe, N ;

Adachi, I ;

Aihara, H ;

Akai, K ;

Akatsu, M ;

Akemoto, M ;

Asano, Y ;

Aso, T ;

Aulchenko, V ;

Aushev, T ;

Aziz, T ;

Bahinipati, S ;

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 ;

Danilov, M ;

Dash, M ;

Dong, LY ;

Dowd, R ;

Dragic, J ;

Drutskoy, A ;

Eidelman, S ;

Eiges, V ;

Enari, Y ;

Epifanov, D .

PHYSICAL REVIEW LETTERS, 2004, 93 (19) :191802-1

[9]

CHARLES J, IN PRESS EUR PHYS C

[10] Time-dependent CP-violating asymmetries in b→s(q)over-barq transitions -: art. no. 012004 [J].

Chen, KF ;

Fang, F ;

Garmash, A ;

Hara, K ;

Hazumi, M ;

Higuchi, T ;

Kakuno, H ;

Kusaka, A ;

Shibata, T ;

Tajima, O ;

Trabelsi, K ;

Ziegler, T ;

Abe, K ;

Aihara, H ;

Asano, Y ;

Aushev, T ;

Bahinipati, S ;

Bakich, AM ;

Ban, Y ;

Barberio, E ;

Barbero, M ;

Bay, A ;

Bedny, I ;

Bitenc, U ;

Bizjak, I ;

Blyth, S ;

Bondar, A ;

Bozek, A ;

Bracko, M ;

Brodzicka, J ;

Browder, TE ;

Chang, P ;

Chao, Y ;

Chen, A ;

Chen, WT ;

Cheon, BG ;

Chistov, R ;

Choi, SK ;

Choi, Y ;

Choi, YK ;

Chuvikov, A ;

Dalseno, J ;

Danilov, M ;

Dash, M ;

Dong, LY ;

Drutskoy, A ;

Eidelman, S ;

Enari, Y ;

Fratina, S .

PHYSICAL REVIEW D, 2005, 72 (01) :1-15

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