Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √(s)=8 TeV with the ATLAS detector

被引：59

作者：

Aad, G. ^{[74
]}

Abajyan, T. ^{[32
]}

Abbott, B. ^{[154
]}

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

Khalek, S. Abdel ^{[158
,159
]}

Abdinov, O. ^{[15
]}

Aben, R. ^{[147
,148
]}

Abi, B. ^{[155
]}

Abolins, M. ^{[127
]}

AbouZeid, O. S. ^{[220
]}

Abramowicz, H. ^{[214
]}

Abreu, H. ^{[192
]}

Abulaiti, Y. ^{[205
,206
]}

Acharya, B. S. ^{[227
,228
,248
]}

Adamczyk, L. ^{[62
]}

Adams, D. L. ^{[39
]}

Addy, T. N. ^{[86
]}

Adelman, J. ^{[245
]}

Adomeit, S. ^{[138
]}

Adye, T. ^{[177
]}

Aefsky, S. ^{[34
]}

Agatonovic-Jovin, T. ^{[19
]}

Aguilar-Saavedra, J. A. ^{[170
,171
,172
]}

Agustoni, M. ^{[24
,25
]}

Ahlen, S. P. ^{[33
]}

Ahmad, A. ^{[208
,209
]}

Ahmadov, F. ^{[15
,96
]}

Ahsan, M. ^{[66
]}

Aielli, G. ^{[182
,183
]}

Akesson, T. P. A. ^{[117
]}

Akimoto, G. ^{[216
,217
]}

Akimov, A. V. ^{[134
]}

Alam, M. A. ^{[111
]}

Albert, J. ^{[238
]}

Albrand, S. ^{[83
,84
,85
]}

Alconada Verzini, M. J. ^{[102
,103
]}

Aleksa, M. ^{[46
]}

Aleksandrov, I. N. ^{[96
]}

Alessandria, F. ^{[128
]}

Alexa, C. ^{[40
]}

Alexander, G. ^{[75
,214
]}

Alexandre, G. ^{[75
]}

Alexopoulos, T. ^{[14
]}

Alhroob, M. ^{[227
,229
]}

Aliev, M. ^{[23
]}

Alimonti, G. ^{[128
]}

Alio, L. ^{[121
,122
]}

Alison, J. ^{[47
]}

Allbrooke, B. M. M. ^{[26
]}

Allison, L. J. ^{[104
]}

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] Univ Belgrade, Inst Phys, Belgrade, Serbia

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

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

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

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

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

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

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

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

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

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

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

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

[31] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy

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

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

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

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

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

[37] Fed Univ Sao Joao del Rei UFSJ, Sao Joao Del Rei, Brazil

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

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

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

[41] Natl Inst Res & Dev Isotop & Mol Technol, Dept Phys, Cluj Napoca, 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 / 11期

基金：

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

关键词：

D O I：

10.1103/PhysRevD.88.112006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search is presented for direct chargino production based on a disappearing-track signature using 20.3 fb(-1) of proton-proton collisions at root s = 8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass degenerate with the lightest neutralino and its lifetime is long enough to be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime between 0.1 and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess above the background expectation is observed for candidate tracks with large transverse momentum, and constraints on chargino properties are obtained. In the AMSB scenarios, a chargino mass below 270 GeV is excluded at 95% confidence level.

引用

页码：112006 / 1

页数：23

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