Search for t(t)over-bar resonances in the lepton plus jets final state with ATLAS using 4.7 fb-1 of pp collisions at √s=7 TeV

被引：45

作者：

Aad, G. ^{[73
]}

Abajyan, T. ^{[33
]}

Abbott, B. ^{[152
]}

Abdallah, J. ^{[16
,17
,18
]}

Khalek, S. Abdel ^{[156
,157
]}

Abdelalim, A. A. ^{[74
]}

Abdinov, O. ^{[15
]}

Aben, R. ^{[145
,146
]}

Abi, B. ^{[153
]}

Abolins, M. ^{[125
]}

AbouZeid, O. S. ^{[217
]}

Abramowicz, H. ^{[211
]}

Abreu, H. ^{[190
]}

Abulaiti, Y. ^{[202
,203
]}

Acharya, B. S. ^{[224
,225
,245
]}

Adamczyk, L. ^{[62
]}

Adams, D. L. ^{[40
]}

Addy, T. N. ^{[85
]}

Adelman, J. ^{[242
]}

Adomeit, S. ^{[136
]}

Adragna, P. ^{[109
]}

Adye, T. ^{[175
]}

Aefsky, S. ^{[35
]}

Aguilar-Saavedra, J. A. ^{[168
,169
,170
]}

Agustoni, M. ^{[25
,26
]}

Ahlen, S. P. ^{[34
]}

Ahles, F. ^{[73
]}

Ahmad, A. ^{[205
,206
]}

Ahsan, M. ^{[65
]}

Aielli, G. ^{[180
,181
]}

Akesson, T. P. A. ^{[115
]}

Akimoto, G. ^{[213
,214
]}

Akimov, A. V. ^{[132
]}

Alam, M. A. ^{[110
]}

Albert, J. ^{[235
]}

Albrand, S. ^{[82
,83
,84
]}

Aleksa, M. ^{[46
]}

Aleksandrov, I. N. ^{[95
]}

Alessandria, F. ^{[126
]}

Alexa, C. ^{[41
]}

Alexander, G. ^{[211
]}

Alexandre, G. ^{[74
]}

Alexopoulos, T. ^{[14
]}

Alhroob, M. ^{[224
,226
]}

Aliev, M. ^{[24
]}

Alimonti, G. ^{[126
]}

Alison, J. ^{[163
]}

Allbrooke, B. M. M. ^{[27
]}

Allison, L. J. ^{[103
]}

Allport, P. P. ^{[106
]}

机构：

[1] Univ Adelaide, Sch Chem & Phys, Adelaide, SA, Australia

[2] SUNY Albany, Dept Phys, Albany, NY 12222 USA

[3] Univ Alberta, Dept Phys, Edmonton, AB, Canada

[4] Ankara Univ, Dept Phys, TR-06100 Ankara, Turkey

[5] Gazi Univ, Dept Phys, Ankara, Turkey

[6] TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey

[7] Turkish Atom Energy Commiss, Ankara, Turkey

[8] CNRS, IN2P3, LAPP, Annecy Le Vieux, France

[9] Univ Savoie, Annecy Le Vieux, France

[10] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA

[11] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[12] Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA

[13] Univ Athens, Dept Phys, Athens, Greece

[14] Natl Tech Univ Athens, Dept Phys, Zografos, Greece

[15] Azerbaijan Acad Sci, Inst Phys, Baku 370143, Azerbaijan

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

[17] Univ Autonoma Barcelona, Dept Fis, E-08193 Barcelona, Spain

[18] ICREA, Barcelona, Spain

[19] Univ Belgrade, Inst Phys, Belgrade, Serbia

[20] Univ Belgrade, Vinca Inst Nucl Sci, Belgrade, Serbia

[21] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[22] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA

[23] Univ Calif Berkeley, Berkeley, CA 94720 USA

[24] Humboldt Univ, Dept Phys, Berlin, Germany

[25] Univ Bern, Albert Einstein Ctr Fundamental Phys, Bern, Switzerland

[26] Univ Bern, High Energy Phys Lab, Bern, Switzerland

[27] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

[28] Bogazici Univ, Dept Phys, Istanbul, Turkey

[29] Dogus Univ, Div Phys, Istanbul, Turkey

[30] Gaziantep Univ, Dept Engn Phys, Gaziantep, Turkey

[31] Ist Nazl Fis Nucl, Sez Bologna, Milan, Italy

[32] Univ Bologna, Dipartmento Fis, Bologna, Italy

[33] Univ Bonn, Inst Phys, Bonn, Germany

[34] Boston Univ, Dept Phys, Boston, MA 02215 USA

[35] Brandeis Univ, Dept Phys, Waltham, MA 02254 USA

[36] Univ Fed Rio de Janeiro, COPPE, EE, IF, Rio De Janeiro, Brazil

[37] Fed Univ Juiz de Fora UFJF, Juiz De Fora, Brazil

[38] Fed Univ Sao Joao del Rei UFSH, Sao Joao Del Rei, Brazil

[39] Univ Sao Paulo, Inst Fis, BR-01498 Sao Paulo, Brazil

[40] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[41] Natl Inst Phys & Nucl Engn, Bucharest, Romania

[42] Univ Politehn Bucuresti, Bucharest, Romania

[43] Univ Buenos Aires, Dept Fis, Buenos Aires, DF, Argentina

[44] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[45] Carleton Univ, Dept Phys, Ottawa, ON K1S 5B6, Canada

[46] CERN, Geneva, Switzerland

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

[48] Pontificia Univ Catolica Chile, Dept Fis, Santiago, Chile

[49] Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile

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

来源：

PHYSICAL REVIEW D | 2013年 / 88卷 / 01期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 巴西圣保罗研究基金会;

关键词：

PARTON DISTRIBUTIONS; PAIR PRODUCTION; ALGORITHMS; LHC;

D O I：

10.1103/PhysRevD.88.012004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for new particles that decay into top quark pairs (t (t) over bar) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb(-1) of proton-proton (pp) collision data collected at a center-of-mass energy root s = 7 TeV. In the t (t) over bar) -> WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The t (t) over bar) system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis. A search for local excesses in the number of data events compared to the Standard Model expectation in the t (t) over bar) invariant mass spectrum is performed. No evidence for a t (t) over bar) resonance is found and 95% credibility-level limits on the production rate are determined for massive states predicted in two benchmark models. The upper limits on the cross section times branching ratio of a narrow Z' resonance range from 5.1 pb for a boson mass of 0.5 TeV to 0.03 pb for a mass of 3 TeV. A narrow leptophobic topcolor Z' resonance with a mass below 1.74 TeV is excluded. Limits are also derived for a broad color-octet resonance with m 15.3%. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.07 TeV.

引用

页数：28

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