Direct Top-Quark Width Measurement at CDF

被引：23

作者：

Aaltonen, T. ^{[1
,2
]}

Alvarez Gonzalez, B. ^{[13
]}

Amerio, S. ^{[53
]}

Amidei, D. ^{[44
]}

Anastassov, A. ^{[48
]}

Annovi, A. ^{[22
]}

Antos, J. ^{[16
,17
]}

Apollinari, G. ^{[20
]}

Appel, J. A. ^{[20
]}

Apresyan, A. ^{[62
]}

Arisawa, T. ^{[74
]}

Artikov, A. ^{[18
]}

Asaadi, J. ^{[68
]}

Ashmanskas, W. ^{[20
]}

Auerbach, B. ^{[77
]}

Aurisano, A. ^{[68
]}

Azfar, F. ^{[52
]}

Badgett, W. ^{[20
]}

Barbaro-Galtieri, A. ^{[4
,35
]}

Barnes, V. E. ^{[62
]}

Barnett, B. A. ^{[27
]}

Barria, P. ^{[57
,59
]}

Bartos, P. ^{[16
,17
]}

Bauce, M. ^{[53
,54
]}

Bauer, G. ^{[39
]}

Bedeschi, F. ^{[57
]}

Beecher, D. ^{[37
]}

Behari, S. ^{[27
]}

Bellettini, G. ^{[57
,58
]}

Bellinger, J. ^{[76
]}

Benjamin, D. ^{[19
]}

Beretvas, A. ^{[20
]}

Bhatti, A. ^{[64
]}

Binkley, M. ^{[20
]}

Bisello, D. ^{[53
,54
]}

Bizjak, I. ^{[37
]}

Bland, K. R. ^{[7
]}

Blocker, C. ^{[10
]}

Blumenfeld, B. ^{[27
]}

Bocci, A. ^{[19
]}

Bodek, A. ^{[63
]}

Bortoletto, D. ^{[62
]}

Boudreau, J. ^{[61
]}

Boveia, A. ^{[15
]}

Brau, B. ^{[20
]}

Brigliadori, L. ^{[8
,9
]}

Brisuda, A. ^{[16
,17
]}

Bromberg, C. ^{[45
]}

Brucken, E. ^{[1
,2
]}

Bucciantonio, M. ^{[57
,58
]}

机构：

[1] Univ Helsinki, Dept Phys, Div High Energy Phys, FIN-00014 Helsinki, Finland

[2] Helsinki Inst Phys, FIN-00014 Helsinki, Finland

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

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

[5] Univ Athens, GR-15771 Athens, Greece

[6] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Bellaterra, Barcelona, Spain

[7] Baylor Univ, Waco, TX 76798 USA

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

[9] Univ Bologna, I-40127 Bologna, Italy

[10] Brandeis Univ, Waltham, MA 02254 USA

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

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

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

[14] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

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

[16] Inst Expt Phys, Kosice 04001, Slovakia

[17] Comenius Univ, Bratislava 84248, Slovakia

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

[19] Duke Univ, Durham, NC 27708 USA

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

[21] Univ Florida, Gainesville, FL 32611 USA

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

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

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

[25] Harvard Univ, Cambridge, MA 02138 USA

[26] Univ Illinois, Urbana, IL 61801 USA

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

[28] Karlsruhe Inst Technol, Inst Expt Phys, D-76131 Karlsruhe, Germany

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

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

[31] Sungkyunkwan Univ, Suwon 440746, South Korea

[32] Korea Inst Sci & Technol Informat, Taejon 305806, South Korea

[33] Chonnam Natl Univ, Kwangju 500757, South Korea

[34] Chonbuk Natl Univ, Jeonju 561756, South Korea

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

[36] Univ Liverpool, Liverpool L69 7ZE, Merseyside, England

[37] UCL, London WC1E 6BT, England

[38] Ctr Invest Energet Medioambientales & Tecnol, E-28040 Madrid, Spain

[39] MIT, Cambridge, MA 02139 USA

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

[41] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada

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

[43] TRIUMF, Vancouver, BC V6T 2A3, Canada

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

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

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

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

[48] Northwestern Univ, Evanston, IL 60208 USA

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

[50] Okayama Univ, Okayama 7008530, Japan

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 23期

基金：

瑞士国家科学基金会; 加拿大自然科学与工程研究理事会; 英国科学技术设施理事会; 俄罗斯基础研究基金会; 芬兰科学院; 美国国家科学基金会; 新加坡国家研究基金会;

关键词：

DECAYS;

D O I：

10.1103/PhysRevLett.105.232003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a measurement of the top-quark width in the lepton + jets decay channel of t (t) over bar events produced in p (p) over bar collisions at Fermilab's Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3 fb(-1) of integrated luminosity, we identify 756 candidate events. The top-quark mass and the mass of the hadronically decaying W boson that comes from the top-quark decay are reconstructed for each event and compared with templates of different top-quark widths (Gamma(t)) and deviations from nominal jet energy scale (Delta(JES)) to perform a simultaneous fit for both parameters, where Delta(JES) is used for the in situ calibration of the jet energy scale. By applying a Feldman-Cousins approach, we establish an upper limit at 95% confidence level (CL) of Gamma(t) < 7.6 GeV and a two-sided 68% CL interval of 0.3 GeV < Gamma(t) < 4.4 GeV for a top-quark mass of 172.5 GeV/c(2), which are consistent with the standard model prediction.

引用

页数：7

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