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

被引：138

作者：

Chao, Y ^{[1
]}

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

机构：

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

[2] Aomori Univ, Aomori, Japan

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

[4] Chiba Univ, Chiba, Japan

[5] Chonnam Natl Univ, Kwangju, South Korea

[6] Chuo Univ, Tokyo 112, Japan

[7] Univ Cincinnati, Cincinnati, OH 45221 USA

[8] Goethe Univ Frankfurt, D-6000 Frankfurt, Germany

[9] Gyeongsang Natl Univ, Chinju, South Korea

[10] Univ Hawaii, Honolulu, HI 96822 USA

[11] High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

[12] Hiroshima Inst Technol, Hiroshima, Japan

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

[14] Inst High Energy Phys, Vienna, Austria

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

[16] Jozef Stefan Inst, Ljubljana, Slovenia

[17] Kanagawa Univ, Yokohama, Kanagawa, Japan

[18] Korea Univ, Seoul 136701, South Korea

[19] Kyoto Univ, Kyoto, Japan

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

[21] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol Lausanne, CH-1015 Lausanne, Switzerland

[22] Univ Ljubljana, Ljubljana, Slovenia

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

[24] Univ Melbourne, Parkville, Vic 3052, Australia

[25] Nagoya Univ, Nagoya, Aichi, Japan

[26] Nara Womens Univ, Nara 630, Japan

[27] Natl Cent Univ, Chungli 32054, Taiwan

[28] Natl Kaohsiung Normal Univ, Kaohsiung, Taiwan

[29] Natl United Univ, Miaoli, Taiwan

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

[31] Nihon Dent Coll, Niigata, Japan

[32] Niigata Univ, Niigata, Japan

[33] Osaka City Univ, Osaka 558, Japan

[34] Osaka Univ, Osaka, Japan

[35] Panjab Univ, Chandigarh 160014, India

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

[37] Princeton Univ, Princeton, NJ 08545 USA

[38] RIKEN BNL Res Ctr, Upton, NY 11973 USA

[39] Saga Univ, Saga 840, Japan

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

[41] Seoul Natl Univ, Seoul, South Korea

[42] Sungkyunkwan Univ, Suwon, South Korea

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

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

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

[46] Tohoku Gakuin Univ, Tagajo, Miyagi, Japan

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

[48] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[49] Tokyo Inst Technol, Tokyo 152, Japan

[50] Tokyo Metropolitan Univ, Tokyo 158, Japan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 19期

基金：

中国国家自然科学基金; 日本学术振兴会; 澳大利亚研究理事会;

关键词：

We thank the KEKB group for the excellent operation of the accelerator; the KEK Cryogenics group for the efficient operation of the solenoid; and the KEK computer group and the NII for valuable computing and Super-SINET network support. We acknowledge support from MEXT and [!text type='JS']JS[!/text]PS (Japan); ARC and DEST (Australia); NSFC (Contract No. 10175071; China); DST (India); the BK21 program of MOEHRD and the CHEP SRC program of KOSEF (Korea); KBN (Contract No. 2P03B 01324; Poland); MIST (Russia); MESS (Slovenia); NSC and MOE (Taiwan); and DOE (USA);

D O I：

10.1103/PhysRevLett.93.191802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report evidence for direct CP violation in the decay B-0-->K(+)pi(-) with 253 fb(-1) of data collected with the Belle detector at the KEKB e(+)e(-) collider. Using 275x10(6) B(B) over bar pairs we observe a B-->K(+/-)pi(-/+) signal with 2140+/-53 events. The measured CP violating asymmetry is A(CP)(K(+)pi(-))=-0.101+/-0.025(stat)+/-0.005(syst), corresponding to a significance of 3.9sigma including systematics. We also search for CP violation in the decays B+-->K(+)pi(0) and B+-->pi(+)pi(0). The measured CP violating asymmetries are A(CP)(K(+)pi(0))=0.04+/-0.05(stat)+/-0.02(syst) and A(CP)(pi(+)pi(0))=-0.02+/-0.10(stat)+/-0.01(syst), corresponding to the intervals -0.05< A(CP)(K(+)pi(0))<0.13 and -0.18< A(CP)(pi(+)pi(0))<0.14 at 90% confidence level.

引用

页码：191802 / 1

页数：6

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