Measurement of Β(B-over-bar0→D+l-(ν)over-bar) and determination of |Vcb|

被引：52

作者：

Abe, K ^{[1
]}

Abe, R

Abe, T

Adachi, I

Ahn, BS

Aihara, H

Akatsu, M

Asano, Y

Aso, T

Aulchenko, V

Aushev, T

Bakich, AM

Ban, Y

Banas, E

Behari, S

Behera, PK

Bondar, A

Bozek, A

Browder, TE

Casey, BCK

Chang, P

Chao, Y

Cheon, BG

Chistov, R

Choi, SK

Choi, Y

Dong, LY

Drutskoy, A

Eidelman, S

Eiges, V

Everton, CW

Fang, F

Fujii, H

Fukunaga, C

Fukushima, M

Gabyshev, N

Garmash, A

Gershon, T

Gordon, A

Guo, R

Haba, J

Hamasaki, H

Hanagaki, K

Handa, F

Hara, K

Hara, T

Hastings, NC

Hayashii, H

Hazumi, M

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] Chuo Univ, Tokyo 112, Japan

[5] Univ Cincinnati, Cincinnati, OH USA

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

[7] Gyeongsang Natl Univ, Chinju, South Korea

[8] Univ Hawaii, Honolulu, HI 96822 USA

[9] Hiroshima Inst Technol, Hiroshima, Japan

[10] Univ Tokyo, Inst Cosm Ray Res, Tokyo, Japan

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

[12] Inst High Energy Phys, Vienna, Austria

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

[14] Jozef Stefan Inst, Ljubljana, Slovenia

[15] Kanagawa Univ, Yokohama, Kanagawa, Japan

[16] Korea Univ, Seoul 136701, South Korea

[17] Kyoto Univ, Kyoto, Japan

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

[19] Univ Lausanne, IPHE, Lausanne, Switzerland

[20] Univ Ljubljana, Ljubljana, Slovenia

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

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

[23] Nagasaki Inst Appl Sci, Nagasaki, Japan

[24] Nagoya Univ, Nagoya, Aichi, Japan

[25] Nara Womens Univ, Nara 630, Japan

[26] Natl Kaohsiung Normal Univ, Kaohsiung, Taiwan

[27] Natl Lien Ho Inst Technol, Miaoli, Taiwan

[28] Natl Taiwan Univ, Taipei 10764, Taiwan

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

[30] Nihon Dent Coll, Niigata, Japan

[31] Niigata Univ, Niigata, Japan

[32] Osaka City Univ, Osaka 558, Japan

[33] Osaka Univ, Osaka, Japan

[34] Panjab Univ, Chandigarh 160014, India

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

[36] Princeton Univ, Princeton, NJ 08544 USA

[37] Saga Univ, Saga 840, Japan

[38] Seoul Natl Univ, Seoul, South Korea

[39] Sungkyunkwan Univ, Suwon 440746, South Korea

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

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

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

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

[44] Univ Tokyo, Tokyo, Japan

[45] Tokyo Inst Technol, Tokyo 152, Japan

[46] Tokyo Metropolitan Univ, Tokyo 158, Japan

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

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

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

[50] Utkal Univ, Bhubaneswar 751004, Orissa, India

来源：

PHYSICS LETTERS B | 2002年 / 526卷 / 3-4期

基金：

日本学术振兴会; 澳大利亚研究理事会;

关键词：

CKM matrix; semileptonic; B decay;

D O I：

10.1016/S0370-2693(01)01483-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of the branching fraction for the semileptonic B decay (B) over bar (0) --> D(+)l(-)(v) over bar, where l(-) can be either an electron or a muon. We find Gamma((B) over bar (0) --> D(+)l(-)(v) over bar) = (13.79 +/- 0.76 +/- 2.51) ns(-1), and the resulting branching fraction B((B) over bar (0) --> D(+)e(-)(v) over bar) = (2.13 +/- 0.12 +/- 0.39)%, where the first error is statistical and the second systematic. We also investigate the (B) over bar (0) --> D(+)l(-)(v) over bar form factor and the implications of the result for \V-cb\. From a fit to the differential decay distribution we obtain the rate normalization \V-cb\F-D(1) = (4.11 +/- 0.44 +/- 0.52) X 10(-2). Using a theoretical calculation of F-D(1), the Cabibbo-Kobayashi-Maskawa matrix element \V-cb\ = (4.19 +/- 0.45 +/- 0.53 +/- 0.30) x 10(-2) is obtained, where the last error comes from the theoretical uncertainty of F-D(1). The results are based on a data sample of 10.2 fb(-1) recorded at the gamma(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：258 / 268

页数：11

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