Measurement of the fraction of t(t)over-bar production via gluon-gluon fusion in p(p)over-bar collisions at √s=1.96 Tev

被引：7

作者：

Aaltonen, T. ^{[27
,28
]}

Adelman, J. ^{[16
]}

Akimoto, T. ^{[71
]}

Albrow, M. G. ^{[21
]}

Alvarez Gonzaelez, B. ^{[14
]}

Amerio, S. ^{[53
,54
]}

Amidei, D. ^{[44
]}

Anastassov, A. ^{[48
]}

Annovi, A. ^{[23
]}

Antos, J. ^{[17
,18
]}

Apollinari, G. ^{[21
]}

Apresyan, A. ^{[62
]}

Arisawa, T. ^{[73
]}

Artikov, A. ^{[19
]}

Ashmanskas, W. ^{[21
]}

Attal, A. ^{[4
]}

Aurisano, A. ^{[68
]}

Azfar, F. ^{[52
]}

Azzurri, P. ^{[57
,60
]}

Badgett, W. ^{[21
]}

Barbaro-Galtieri, A. ^{[37
]}

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

Barnett, B. A. ^{[30
]}

Bartsch, V. ^{[39
]}

Bauer, G. ^{[41
]}

Beauchemin, P. -H. ^{[42
,43
]}

Bedeschi, F. ^{[57
]}

Bednar, P. ^{[17
,18
]}

Beecher, D. ^{[39
]}

Behari, S. ^{[30
]}

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

Bellinger, J. ^{[75
]}

Benjamin, D. ^{[20
]}

Beretvas, A. ^{[21
]}

Beringer, J. ^{[37
]}

Bhatti, A. ^{[64
]}

Binkley, M. ^{[21
]}

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

Bizjak, I. ^{[39
]}

Blair, R. E. ^{[2
]}

Blocker, C. ^{[8
]}

Blumenfeld, B. ^{[30
]}

Bocci, A. ^{[20
]}

Bodek, A. ^{[63
]}

Boisvert, V. ^{[63
]}

Bolla, G. ^{[62
]}

Bortoletto, D. ^{[62
]}

Boudreau, J. ^{[61
]}

Boveia, A. ^{[12
]}

Brau, B. ^{[12
]}

机构：

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

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

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

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

[5] Baylor Univ, Waco, TX 76798 USA

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

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

[8] Brandeis Univ, Waltham, MA 02254 USA

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

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

[11] Univ Calif San Diego, La Jolla, CA 92093 USA

[12] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA

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

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

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

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

[17] Comenius Univ, Bratislava 84248, Slovakia

[18] Inst Expt Phys, Kosice 04001, Slovakia

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

[20] Duke Univ, Durham, NC 27708 USA

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

[22] Univ Florida, Gainesville, FL 32611 USA

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

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

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

[26] Harvard Univ, Cambridge, MA 02138 USA

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

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

[29] Univ Illinois, Urbana, IL 61801 USA

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

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

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

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

[34] Sungkyunkwan Univ, Suwon 440746, South Korea

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

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

[37] Ernest O Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

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

[39] UCL, London WC1E 6BT, England

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

[41] MIT, Cambridge, MA 02139 USA

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

[43] Univ Toronto, Toronto, ON M5S 1A7, 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 D | 2009年 / 79卷 / 03期

基金：

瑞士国家科学基金会; 美国国家科学基金会; 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; 加拿大自然科学与工程研究理事会;

关键词：

QUARK PAIR PRODUCTION; SPIN CORRELATIONS;

D O I：

10.1103/PhysRevD.79.031101

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of the ratio of the t (t) over bar production cross section via gluon-gluon fusion to the total t (t) over bar production cross section in p (p) over bar collisions at root s = 1.96 Tev at the Tevatron. Using a data sample with an integrated luminosity of 955 pb(-1) recorded by the CDF II detector at Fermilab, we select events based on the t (t) over bar decay to lepton + jets. Using an artificial neural network technique we discriminate between t (t) over bar events produced via q (q) over bar annihilation and gg fusion, and find G(f) = sigma(gg -> t (t) over bar/sigma(p (p) over bar -> t (t) over bar) < 0.33 at the 68% confidence level. This result is combined with a previous measurement to obtain the most stringent measurement of this quantity by CDF to date, G(f) = 0.07(-0.07)(+0.15).

引用

页数：8

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