Search for heavy charged long-lived particles in proton-proton collisions at √s=13 TeV using an ionisation measurement with the ATLAS detector

被引：27

作者：

Aaboud, M. ^{[52
,53
]}

Aad, G. ^{[152
]}

Abbott, B. ^{[180
]}

Abdinov, O. ^{[18
]}

Abeloos, B. ^{[184
]}

Abhayasinghe, D. K. ^{[143
]}

Abidi, S. H. ^{[229
]}

AbouZeid, O. S. ^{[59
]}

Abraham, N. L. ^{[216
]}

Abramowicz, H. ^{[222
]}

Abreu, H. ^{[221
]}

Abulaiti, Y. ^{[8
]}

Acharya, B. S. ^{[98
,99
,258
]}

Adachi, S. ^{[224
,225
]}

Adam, L. ^{[150
]}

Adamczyka, L. ^{[129
]}

Adelman, J. ^{[174
]}

Adersberger, M. ^{[165
]}

Adiguzelc, A. ^{[16
,272
]}

Adye, T. ^{[202
]}

Affolder, A. A. ^{[204
]}

Afik, Y. ^{[221
]}

Agheorghiesei, C. ^{[39
]}

Aguilar-Saavedra, J. A. ^{[192
,197
]}

Ahmadov, F. ^{[18
,122
]}

Aielli, G. ^{[113
,114
]}

Akatsuka, S. ^{[132
]}

Akesson, T. P. A. ^{[146
]}

Akilli, E. ^{[76
]}

Akimov, A. V. ^{[161
]}

Alberghi, G. L. ^{[33
,34
]}

Albert, J. ^{[240
]}

Albicocco, P. ^{[72
,73
]}

Alconada Verzini, M. J. ^{[136
,137
]}

Alderweireldt, S. ^{[171
]}

Aleksa, M. ^{[55
]}

Aleksandrov, I. N. ^{[122
]}

Alexa, C.

Alexopoulos, T. ^{[12
]}

Alhroob, M. ^{[180
]}

Ali, B. ^{[199
]}

Alimontia, G. ^{[103
]}

Alison, J. ^{[56
]}

Alkire, S. P. ^{[207
]}

Allaire, C. ^{[184
]}

Allbrooke, B. M. M. ^{[216
]}

Allen, B. W. ^{[183
]}

Allport, P. P. ^{[31
]}

Aloisio, A. ^{[105
,106
]}

Alonso, A. ^{[59
]}

机构：

[1] Univ Adelaide, Dept 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, Ankara, Turkey

[5] Istanbul Aydin Univ, Istanbul, Turkey

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

[7] Univ Savoie Mt Blanc, Univ Grenoble Alpes, LAPP, CNRS,IN2P3, Annecy, France

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

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

[10] Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA

[11] Natl & Kapodistrian Univ Athens, Phys Dept, Athens, Greece

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

[13] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[14] Bahcesehir Univ, Fac Engn & Nat Sci, Istanbul, Turkey

[15] Istanbul Bilgi Univ, Fac Engn & Nat Sci, Istanbul, Turkey

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

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

[18] Azerbaijan Acad Sci, Inst Phys, Baku, Azerbaijan

[19] Barcelona Inst Sci & Technol, IFAE, Barcelona, Spain

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

[21] Tsinghua Univ, Phys Dept, Beijing, Peoples R China

[22] Nanjing Univ, Dept Phys, Nanjing, Jiangsu, Peoples R China

[23] UCAS, Beijing, Peoples R China

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

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

[26] Lawrence Berkeley Natl Lab, Phys Div, Berkeley, CA USA

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

[28] Humboldt Univ, Inst Phys, Berlin, Germany

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

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

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

[32] Univ Antonio Narino, Ctr Invest, Bogota, Colombia

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

[34] INFN, Sez Bologna, Bologna, Italy

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

[36] Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA

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

[38] Transilvania Univ Brasov, Brasov, Romania

[39] Alexandru Ioan Cuza Univ, Dept Phys, Iasi, Romania

[40] Natl Inst Res & Dev Isotop & Mol Technol, Phys Dept, Cluj Napoca, Romania

[41] West Univ Timisoara, Timisoara, Romania

[42] Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia

[43] Slovak Acad Sci, Inst Expt Phys, Dept Subnucl Phys, Kosice, Slovakia

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

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

[46] Univ Cambridge, Cavendish Lab, Cambridge, England

[47] Univ Cape Town, Dept Phys, Cape Town, South Africa

[48] Univ Witwatersrand, Sch Phys, Johannesburg, South Africa

[49] Carleton Univ, Dept Phys, Ottawa, ON, Canada

[50] Univ Hassan 2, Reseau Univ Phys Hautes Energies, Fac Sci Ain Chock, Casablanca, Morocco

来源：

PHYSICS LETTERS B | 2019年 / 788卷

基金：

加拿大自然科学与工程研究理事会; 巴西圣保罗研究基金会;

关键词：

GLUINO PRODUCTION; SUPERSYMMETRY; SQUARK;

D O I：

10.1016/j.physletb.2018.10.055

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This Letter presents a search for heavy charged long-lived particles produced in proton-proton collisions at root s= 13 TeV at the LHC using a data sample corresponding to an integrated luminosity of 36.1 fb(-1) collected by the ATLAS experiment in 2015 and 2016. These particles are expected to travel with a velocity significantly below the speed of light, and therefore have a specific ionisation higher than any high-momentum Standard Model particle of unit charge. The pixel subsystem of the ATLAS detector is used in this search to measure the ionisation energy loss of all reconstructed charged particles which traverse the pixel detector. Results are interpreted assuming the pair production of R-hadrons as composite colourless states of a long-lived gluino and Standard Model partons. No significant deviation from Standard Model background expectations is observed, and lifetime-dependent upper limits on R-hadron production cross-sections and gluino masses are set, assuming the gluino always decays to two quarks and a 100 GeV stable neutralino. R-hadrons with lifetimes above 1.0 ns are excluded at the 95% confidence level, with lower limits on the gluino mass ranging between 1290 GeV and 2060 GeV. In the case of stable R-hadrons, the lower limit on the gluino mass at the 95% confidence level is 1890 GeV. (C) 2018 The Author. Published by Elsevier B.V.

引用

页码：96 / 116

页数：21

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