Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in p(p)over-bar Collisions at √s=1.96 TeV

被引：32

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. ^{[60
]}

Arisawa, T. ^{[72
]}

Artikov, A. ^{[18
]}

Asaadi, J. ^{[66
]}

Ashmanskas, W. ^{[20
]}

Auerbach, B. ^{[75
]}

Aurisano, A. ^{[66
]}

Azfar, F. ^{[52
]}

Badgett, W. ^{[20
]}

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

Barnes, V. E. ^{[60
]}

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

Barria, P. ^{[56
,57
]}

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

Bauce, M. ^{[9
,53
]}

Bauer, G. ^{[39
]}

Bedeschi, F. ^{[56
]}

Beecher, D. ^{[37
]}

Behari, S. ^{[27
]}

Bellettini, G. ^{[56
,57
]}

Bellinger, J. ^{[74
]}

Benjamin, D. ^{[19
]}

Beretvas, A. ^{[20
]}

Bhatti, A. ^{[62
]}

Binkley, M. ^{[20
]}

Bisello, D. ^{[9
,53
]}

Bizjak, I. ^{[37
]}

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

Blumenfeld, B. ^{[27
]}

Bocci, A. ^{[19
]}

Bodek, A. ^{[61
]}

Bortoletto, D. ^{[60
]}

Boudreau, J. ^{[59
]}

Boveia, A. ^{[15
]}

Brau, B. ^{[20
]}

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

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

Bromberg, C. ^{[45
]}

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

Bucciantonio, M. ^{[56
,57
]}

Budagov, J. ^{[18
]}

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, ICREA, Inst Fis Altes Energies, E-08193 Bellaterra, Barcelona, Spain

[7] Baylor Univ, Waco, TX 76798 USA

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

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

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

[11] Univ Calif Irvine, Irvine, CA 92697 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] Comenius Univ, Bratislava 84248, Slovakia

[17] Inst Expt Phys, Kosice 04001, 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 Kernphys, 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 | 2011年 / 106卷 / 19期

基金：

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

关键词：

PHYSICS;

D O I：

10.1103/PhysRevLett.106.191801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a search for a new particle T' decaying to top quark via T' -> t + X, where X is an invisible particle. In a data sample with 4.8 fb(-1) of integrated luminosity collected by the CDF II detector at Fermilab in p (p) over bar collisions with root s = 1.96 TeV, we search for pair production of T' in the lepton + jets channel, p (p) over bar -> t (t) over bar + X + X -> lvbqq'b + X + X. We interpret our results primarily in terms of a model where T' are exotic fourth generation quarks and X are dark matter particles. Current direct and indirect bounds on such exotic quarks restrict their masses to be between 300 and 600 GeV/c(2), the dark matter particle mass being anywhere below m(T'). The data are consistent with standard model expectations, and we set 95% confidence level limits on the generic production of T'(T) over bar -> t (t) over bar + X + X. For the dark matter model we exclude T' at 95% confidence level up to m(T)' = 360 GeV/c(2) for m(X) <= 100 GeV/c(2).

引用

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