Search for pair-production of vector-like quarks in pp collision events at √s=13 TeV with at least one leptonically decaying Z boson and a third-generation quark with the ATLAS detector

被引:9
作者
Aad, G. [157 ]
Abbott, B. [178 ]
Abbott, D. C. [158 ]
Abud, A. Abed [62 ]
Abeling, K. [83 ]
Abhayasinghe, D. K. [149 ]
Abidi, S. H. [47 ]
Aboulhorma, A. [61 ]
Abramowicz, H. [223 ]
Abreu, H. [222 ]
Abulaiti, Y. [175 ]
Hoffman, A. C. Abusleme [201 ]
Acharya, B. S. [106 ,107 ,259 ]
Achkar, B. [83 ]
Adam, L. [155 ]
Bourdarios, C. Adam [5 ]
Adamczyk, L. [135 ]
Adamek, L. [228 ]
Addepalli, S. V. [38 ]
Adelman, J. [172 ]
Adiguzel, A. [28 ,30 ]
Adorni, S. [84 ]
Adye, T. [198 ]
Affolder, A. A. [200 ]
Afik, Y. [62 ]
Agaras, M. N. [14 ]
Agarwala, J. [115 ,116 ]
Aggarwal, A. [155 ]
Agheorghiesei, C. [41 ]
Aguilar-Saavedra, J. A. [193 ]
Ahmad, A. [62 ]
Ahmadov, F. [62 ,265 ]
Ahmed, W. S. [159 ]
Ai, X. [74 ,75 ]
Aielli, G. [121 ,122 ]
Aizenberg, I. [243 ]
Akbiyik, M. [155 ]
Akesson, T. P. A. [152 ]
Akimov, A. V. [62 ]
Al Khoury, K. [65 ]
Alberghi, G. L. [35 ]
Albert, J. [239 ]
Albicocco, P. [80 ,81 ]
Verzini, M. J. Alconada [142 ,143 ]
Alderweireldt, S. [79 ]
Aleksa, M. [62 ]
Aleksandrov, I. N. [62 ]
Alexa, C. [40 ]
Alexopoulos, T. [11 ]
Alfonsi, A. [170 ,171 ]
机构
[1] Univ Adelaide, Dept Phys, Adelaide, SA, Australia
[2] Univ Alberta, Dept Phys, Edmonton, AB, Canada
[3] Ankara Univ, Dept Phys, Ankara, Turkiye
[4] TOBB Univ Econ & Technol, Div Phys, Ankara, Turkiye
[5] Univ Savoie Mt Blanc, LAPP, CNRS, IN2P3, Annecy, France
[6] Univ Paris Cite, APC, CNRS, IN2P3, Paris, France
[7] Argonne Natl Lab, Div High Energy Phys, 9700 S Cass Ave, Argonne, IL 60439 USA
[8] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
[9] Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA
[10] Natl & Kapodistrian Univ Athens, Dept Phys, Athens, Greece
[11] Natl Tech Univ Athens, Dept Phys, Zografos, Greece
[12] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA
[13] Azerbaijan Acad Sci, Inst Phys, Baku, Azerbaijan
[14] Barcelona Inst Sci & Technol, IFAE, Barcelona, Spain
[15] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China
[16] Tsinghua Univ, Dept Phys, Beijing, Peoples R China
[17] Nanjing Univ, Dept Phys, Nanjing, Peoples R China
[18] UCAS, Beijing, Peoples R China
[19] Univ Belgrade, Inst Phys, Belgrade, Serbia
[20] Univ Bergen, Dept Phys & Technol, Bergen, Norway
[21] Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA USA
[22] Humboldt Univ, Inst Phys, Berlin, Germany
[23] Univ Bern, Albert Einstein Ctr Fundamental Phys, Bern, Switzerland
[24] Univ Bern, High Energy Phys Lab, Bern, Switzerland
[25] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England
[26] Bahcesehir Univ, Fac Engn & Nat Sci, Istanbul, Turkiye
[27] Istanbul Bilgi Univ, Fac Engn & Nat Sci, Istanbul, Turkiye
[28] Bogazici Univ, Dept Phys, Istanbul, Turkiye
[29] Gaziantep Univ, Dept Engn Phys, Gaziantep, Turkiye
[30] Istanbul Univ, Dept Phys, Istanbul, Turkiye
[31] Univ Antonio Narino, Fac Ciencias, Bogota, Colombia
[32] Univ Antonio Narino, Ctr Invest, Bogota, Colombia
[33] Univ Nacl Colombia, Dept Fis, Bogota, Colombia
[34] Univ Bologna, Dipartimento Fis & Astron A Righi, Bologna, Italy
[35] INFN Sez Bologna, Bologna, Italy
[36] Univ Bonn, Phys Inst, Bonn, Germany
[37] Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA
[38] Brandeis Univ, Dept Phys, Waltham, MA 02254 USA
[39] Transilvania Univ Brasov, Brasov, Romania
[40] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania
[41] Alexandru Ioan Cuza Univ, Dept Phys, Iasi, Romania
[42] Natl Inst Res & Dev Isotop & Mol Technol, Dept Phys, Cluj Napoca, Romania
[43] Univ Politehn Bucuresti, Bucharest, Romania
[44] West Univ Timisoara, Timisoara, Romania
[45] Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia
[46] Slovak Acad Sci, Inst Expt Phys, Dept Subnucl Phys, Kosice, Slovakia
[47] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[48] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, Buenos Aires, DF, Argentina
[49] Consejo Nacl Invest Cient & Tecn, Inst Fis Buenos Aires IFIBA, Buenos Aires, DF, Argentina
[50] Calif State Univ Los Angeles, Los Angeles, CA 90032 USA
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;
关键词
D O I
10.1016/j.physletb.2023.138019
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A search for the pair-production of vector-like quarks optimized for decays into a Z boson and a third-generation Standard Model quark is presented, using the full Run 2 dataset corresponding to 139 fb-1 of pp collisions at & RADIC;s = 13 TeV, collected in 2015-2018 with the ATLAS detector at the Large Hadron Collider. The targeted final state is characterized by the presence of a Z boson with high transverse momentum, reconstructed from a pair of same-flavour leptons with opposite-sign charges, as well as by the presence of b-tagged jets and high-transverse-momentum large-radius jets reconstructed from calibrated smaller-radius jets. Events with exactly two or at least three leptons are used, which are further categorized by the presence of boosted W, Z, and Higgs bosons and top quarks. The categorization is performed using a neural-network-based boosted object tagger to enhance the sensitivity to signal relative to the background. No significant excess above the background expectation is observed and exclusion limits at 95% confidence level are set on the masses of the vector-like partners T and B of the top and bottom quarks, respectively. The limits depend on the branching ratio configurations and, in the case of 100% branching ratio for T-+ Zt and 100% branching ratio for B-+ Zb, this search sets the most stringent limits to date, allowing mT > 1.60 TeV and mB > 1.42 TeV, respectively. & COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.
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页数:25
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