Observation of b→dγ and determination of |Vtd/Vts|

被引：50

作者：

Mohapatra, D. ^{[1
]}

Nakao, M.

Nishida, S.

Abe, K.

Adachi, I.

Aihara, H.

Anipko, D.

Arinstein, K.

Asano, Y.

Aulchenko, V.

Aushev, T.

Bahinipati, S.

Bakich, A. M.

Balagura, V.

Barbero, M.

Bedny, I.

Bitenc, U.

Bizjak, I.

Blyth, S.

Bondar, A.

Bozek, A.

Bracko, M.

Browder, T. E.

Chao, Y.

Chen, A.

Chen, K. -F.

Chen, W. T.

Cheon, B. G.

Chistov, R.

Choi, Y.

Chuvikov, A.

Cole, S.

Dalseno, J.

Danilov, M.

Dash, M.

Dragic, J.

Drutskoy, A.

Eidelman, S.

Epifanov, D.

Fratina, S.

Gabyshev, N.

Gershon, T.

Gokhroo, G.

Golob, B.

Gorisek, A.

Ha, H. C.

Haba, J.

Hara, T.

Hastings, N. C.

机构：

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

[2] Yonsei Univ, Seoul 120749, South Korea

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

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

[5] Tokyo Metropolitan Univ, Tokyo 158, Japan

[6] Tokyo Inst Technol, Tokyo 152, Japan

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

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

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

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

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

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

[13] Sungkyunkwan Univ, Suwon, South Korea

[14] Seoul Natl Univ, Seoul, South Korea

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

[16] Saga Univ, Saga 840, Japan

[17] RIKEN, Brookhaven Natl Lab, Res Ctr, Upton, NY 11973 USA

[18] Princeton Univ, Princeton, NJ 08544 USA

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

[20] Panjab Univ, Chandigarh 160014, India

[21] Osaka Univ, Osaka, Japan

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

[23] Chonnam Natl Univ, Kwangju, South Korea

[24] Univ Cincinnati, Cincinnati, OH 45221 USA

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

[26] Univ Hawaii, Honolulu, HI 96822 USA

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

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

[29] Inst High Energy Phys, Vienna, Austria

[30] Inst High Energy Phys, Protvino, Russia

[31] Inst Theoret & Expt Phys, Moscow, Russia

[32] J Stefan Inst, Ljubljana, Slovenia

[33] Kanagawa Univ, Yokohama, Kanagawa, Japan

[34] Korea Univ, Seoul 136701, South Korea

[35] Kyungpook Natl Univ, Taegu, South Korea

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

[37] Univ Ljubljana, Ljubljana, Slovenia

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

[39] Univ Melbourne, Melbourne, Vic, Australia

[40] Nagoya Univ, Nagoya, Aichi, Japan

[41] Nara Womens Univ, Nara 630, Japan

[42] Natl Cent Univ, Chungli 32054, Taiwan

[43] Nalt United Univ, Miaoli, Taiwan

[44] Natl Taiwan Univ, Dept Phys, Taipei 10764, Taiwan

[45] H Niewodniczanski Inst Nucl Phys, Krakow, Poland

[46] Nippon Dent Univ, Niigata, Japan

[47] Niigata Univ, Niigata, Japan

[48] Nova Gorica Polytech, Nova Gorica, Slovenia

[49] Osaka City Univ, Osaka 558, Japan

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.96.221601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the observation of the flavor-changing neutral current process b -> d gamma using a sample of 386 x 10(6) B meson pairs accumulated by the Belle detector at the KEKB e(+)e(-) collider. We measure branching fractions for the exclusive modes B- -> rho(-)gamma, (B) over bar (0) -> rho(0)gamma, and (B) over bar (0) -> omega gamma. Assuming that these three modes are related by isospin, we find B((B) over bar -> (rho, omega)gamma) = (1.32(-0.31)(+0.34)(stat)(-0.09)(+0.10)(syst)) x 10(-6) with a significance of 5.1 sigma. This result is used to determine the ratio of Cabibbo-Kobayashi-Maskawa matrix elements vertical bar V-td/V-ts vertical bar to be 0.199(-0.025)(+0.026)(exp)(-0.015)(+0.018)(theor).

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页数：5

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