Measurements of branching fractions and CP asymmetries in B → ηh decays -: art. no. 091106

被引：15

作者：

Chang, P ^{[1
]}

Abe, K

Aihara, H

Akatsu, M

Asano, Y

Aushev, T

Bakich, AM

Balagura, V

Ban, Y

Banerjee, S

Bedny, I

Bitenc, U

Bizjak, I

Blyth, S

Bondar, A

Bozek, A

Bracko, M

Brodzicka, J

Browder, TE

Chao, Y

Chen, A

Chen, KF

Cheon, BG

Chistov, R

Choi, SK

Choi, Y

Chuvikov, A

Cole, S

Dalseno, J

Danilov, M

Dash, M

Dragic, J

Drutskoy, A

Eidelman, S

Eiges, V

Fratina, S

Gabyshev, N

Garmash, A

Gershon, T

Gokhroo, G

Guo, R

Haba, J

Hayasaka, K

Hayashii, H

Hazumi, M

Hokuue, T

Hoshi, Y

Hou, S

Hou, WS

机构：

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

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

[9] Hiroshima Inst Technol, Hiroshima, Japan

[10] Inst High Energy Phys, Vienna, Austria

[11] Inst Theoret & Expt Phys, Moscow 117259, 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 Lausanne, 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 Kaohsiung Normal Univ, Kaohsiung, Taiwan

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

[25] Nihon Dent Coll, Niigata, Japan

[26] Niigata Univ, Niigata, Japan

[27] Osaka City Univ, Osaka 558, Japan

[28] Panjab Univ, Chandigarh 160014, India

[29] Osaka Univ, Osaka, Japan

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

[31] Princeton Univ, Princeton, NJ 08544 USA

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

[33] Seoul Natl Univ, Seoul, South Korea

[34] Sungkyunkwan Univ, Suwon, South Korea

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

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

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

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

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

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

[41] Tokyo Inst Technol, Tokyo 152, Japan

[42] Tokyo Metropolitan Univ, Tokyo 158, Japan

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

[44] Yonsei Univ, Seoul 120749, South Korea

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

来源：

PHYSICAL REVIEW D | 2005年 / 71卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.71.091106

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report measurements of B to pseudoscalar-pseudoscalar decays with at least one eta meson in the final state using 140 fb(-1) of data collected by the Belle detector at KEKB e(+)e(-) collider. We observe the decay B+ -> eta pi(+) and find evidence of B+ -> eta K+; the measured branching fractions are B(B+ -> eta pi(+)) = (4.8(-0.7)(+0.8)(stat) +/- 0.3(sys)) x 10(-6) and B(B+ -> eta K+) = (2.1 +/- 0.6(stat) +/- 0.2(sys)) x 10(-6). Their corresponding CP violating asymmetries are measured to be 0.07 +/- 0.15(stat) +/- 0.03(sys) for eta pi(+/-) and -0.49 +/- 0.31(stat) +/- 0.07(sys) for eta K-+/-. No significant signals are found for neutral B -> eta h decays. We report the following upper limits on branching fractions at the 90% confidence level: B(B-0 -> eta K-0) < 2.0 x 10(-6), B(B-0 -> eta pi(0)) < 2.5 x 10(-6) and B(B-0 -> eta eta) < 2.0 x 10(-6).

引用

页码：1 / 6

页数：6

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