First measurement of the ratio B(t → Wb)/B(t → Wq) and associated limit on the Cabibbo-Kobayashi-Maskawa element |Vtb|

被引：34

作者：

Affolder, T ^{[1
]}

Akimoto, H

Akopian, A

Albrow, MG

Amaral, P

Amendolia, SR

Amidei, D

Anikeev, K

Antos, J

Apollinari, G

Arisawa, T

Asakawa, T

Ashmanskas, W

Azfar, F

Azzi-Bacchetta, P

Bacchetta, N

Bailey, MW

Bailey, S

de Barbaro, P

Barbaro-Galtieri, A

Barnes, VE

Barnett, BA

Baroiant, S

Barone, M

Bauer, G

Bedeschi, F

Belforte, S

Bell, WH

Bellettini, G

Bellinger, J

Benjamin, D

Bensinger, J

Beretvas, A

Berge, JP

Berryhill, J

Bevensee, B

Bhatti, A

Binkley, M

Bisello, D

Bishai, M

Blair, RE

Blocker, C

Bloom, K

Blumenfeld, B

Blusk, SR

Bocci, A

Bodek, A

Bokhari, W

Bolla, G

Bonushkin, Y

机构：

[1] Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[3] Argonne Natl Lab, Argonne, IL 60439 USA

[4] Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy

[5] Brandeis Univ, Waltham, MA 02254 USA

[6] Univ Calif Davis, Davis, CA 95616 USA

[7] Univ Calif Los Angeles, Los Angeles, CA 90024 USA

[8] Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain

[9] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[10] Joint Inst Nucl Res, RU-141980 Dubna, Russia

[11] Duke Univ, Durham, NC 27708 USA

[12] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[13] Univ Florida, Gainesville, FL 32611 USA

[14] Ist Nazl Fis Nucl, Nazl Frascati Lab, I-00044 Frascati, Italy

[15] Univ Geneva, CH-1211 Geneva 4, Switzerland

[16] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland

[17] Harvard Univ, Cambridge, MA 02138 USA

[18] Hiroshima Univ, Higashihiroshima 724, Japan

[19] Univ Illinois, Urbana, IL 61801 USA

[20] Johns Hopkins Univ, Baltimore, MD 21218 USA

[21] Johns Hopkins Univ, Baltimore, MD 21218 USA

[22] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[23] Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea

[24] Seoul Natl Univ, Seoul 151742, South Korea

[25] Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea

[26] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 305, Japan

[27] MIT, Cambridge, MA 02139 USA

[28] McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada

[29] Univ Toronto, Toronto, ON M5S 1A7, Canada

[30] Univ Michigan, Ann Arbor, MI 48109 USA

[31] Michigan State Univ, E Lansing, MI 48824 USA

[32] Univ New Mexico, Albuquerque, NM 87131 USA

[33] Ohio State Univ, Columbus, OH 43210 USA

[34] Osaka City Univ, Osaka 588, Japan

[35] Univ Oxford, Oxford OX1 3RH, England

[36] Univ Padua, Ist Nazl Fis Nucl, Sezione Padova, I-35131 Padua, Italy

[37] Univ Penn, Philadelphia, PA 19104 USA

[38] Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy

[39] Scuola Normale Super Pisa, I-56100 Pisa, Italy

[40] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[41] Purdue Univ, W Lafayette, IN 47907 USA

[42] Univ Rochester, Rochester, NY 14627 USA

[43] Rockefeller Univ, New York, NY 10021 USA

[44] Rutgers State Univ, Piscataway, NJ 08855 USA

[45] Texas A&M Univ, College Stn, TX 77843 USA

[46] Texas Tech Univ, Lubbock, TX 79409 USA

[47] Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy

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

[49] Tufts Univ, Medford, MA 02155 USA

[50] Waseda Univ, Tokyo 169, Japan

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.86.3233

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present the first measurement of the ratio of branching fractions R equivalent to B(t --> Wb)/B(t --> Wq) from pa collisions at roots = 1.8 TeV. The data set corresponds to 109 pb(-1) of data recorded by the Collider Detector at Fermilab during the 1992-95 Tevatron run. We measure R = 0.94(-0.24)(+0.31)(stat + syst) or R > 0.61 (0.56) at 90% (95)% C.L., in agreement with the standard model predictions. This measurement yields a limit on the Cabibbo-Kobayashi-Maskawa quark mixing matrix element \V-tb\ under the assumption of three generations and unitarity.

引用

页码：3233 / 3238

页数：6

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