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

被引：79

作者：

Abe, K ^{[1
]}

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

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] Univ Frankfurt, D-6000 Frankfurt, Germany

[5] Univ Hawaii, Honolulu, HI 96822 USA

[6] Hiroshima Inst Technol, Hiroshima, Japan

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

[8] Inst High Energy Phys, Vienna, Austria

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

[10] J Stefan Inst, Ljubljana, Slovenia

[11] Kanagawa Univ, Yokohama, Kanagawa, Japan

[12] Korea Univ, Seoul 136701, South Korea

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

[14] EPFL, Swiss Fed Inst Technol, CH-1015 Lausanne, Switzerland

[15] Univ Ljubljana, Ljubljana, Slovenia

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

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

[18] Nagoya Univ, Nagoya, Aichi, Japan

[19] Nara Womens Univ, Nara 630, Japan

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

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

[22] Nihon Dent Coll, Niigata, Japan

[23] Niigata Univ, Niigata, Japan

[24] Osaka City Univ, Osaka 558, Japan

[25] Osaka Univ, Osaka, Japan

[26] Panjab Univ, Chandigarh 160014, India

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

[28] Princeton Univ, Princeton, NJ 08545 USA

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

[30] Saga Univ, Saga 840, Japan

[31] Univ Sci & Technol China, Hefei, Peoples R China

[32] Seoul Natl Univ, Seoul, South Korea

[33] Sungkyunkwan Univ, Suwon 440746, South Korea

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

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

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

[37] Tohoku Gakuin Univ, Tagajo, Miyagi 985, Japan

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

[39] Tokyo Inst Technol, Tokyo 152, Japan

[40] Tokyo Metropolitan Univ, Tokyo 158, Japan

[41] Tokyo Univ Agr & Technol, Tokyo, Japan

[42] Toyama Natl Coll Maritime Technol, Toyama, Japan

[43] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan

[44] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[45] Yokkaichi Univ, Yokaichi, Japan

[46] Yonsei Univ, Seoul 120749, South Korea

[47] Gyeongsang Natl Univ, Chinju, South Korea

[48] Univ Cincinnati, Cincinnati, OH USA

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

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 02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：

D O I：

10.1103/PhysRevLett.93.021601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first observation of CP violation in B(pp)(pp)(pp)(pp)(pp)(0+p- decays based on 152x106 U(4S)B (B) over bar decays collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We reconstruct a B0+p- CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the distribution of the time intervals between the two B meson decay points, we obtain A)(=+0.580.15(stat)0.07(syst) and S)(=-1.000.21(stat)0.07(syst). We rule out the CP-conserving case, A)(=S)(=0, at a level of 5.2 standard deviations. We also find evidence for direct CP violation with a significance at or greater than 3.2 standard deviations for any S) value.

引用

页码：021601 / 1

页数：5

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