Combination of searches for singly produced vectorlike top quarks in pp collisions at s=13TeV with the ATLAS detector

ATLAS Collaboration; S. Alderweireldt; J.F. Allen; P. J.  Clark; J.R. Curran; D. Duda; S. M. Farrington; Y. Gao; J.M. Gargan; R.Y. Gonzalez Andana; C. Jiang; M. Firdaus M. Soberi; V. J.  Martin; L. Mijović; V.A. Parrish; E.A. Pender; T. Qiu; J.M.  Silva; A.L. Sopio; F. Ustuner; E.M. Villhauer; H. Watson; B.M. Wynne; Z. Xu; E. Zaid

doi:10.1103/PhysRevD.111.012012

Combination of searches for singly produced vectorlike top quarks in pp collisions at s=13TeV with the ATLAS detector

ATLAS Collaboration, S. Alderweireldt, J.F. Allen, P. J. Clark, J.R. Curran, D. Duda, S. M. Farrington, Y. Gao, J.M. Gargan, R.Y. Gonzalez Andana, C. Jiang, M. Firdaus M. Soberi, V. J. Martin, L. Mijović, V.A. Parrish, E.A. Pender, T. Qiu, J.M. Silva, A.L. Sopio, F. UstunerE.M. Villhauer, H. Watson, B.M. Wynne, Z. Xu, E. Zaid

School of Physics and Astronomy

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Abstract

A combination of searches for the single production of vectorlike top quarks (𝑇) is presented. These analyses are based on proton-proton collisions at √𝑠 =13 TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1. The 𝑇 decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a 𝑍 boson (𝑇 →𝐻⁡𝑡 and 𝑇→𝑍⁢𝑡). The individual searches used in the combination are differentiated by the number of leptons (𝑒, 𝜇) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, 𝜅, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.

Original language	English
Article number	012012
Pages (from-to)	1-30
Number of pages	30
Journal	Physical Review D
Volume	111
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.111.012012
Publication status	Published - 29 Jan 2025

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3 Finished
3 Active

Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/27
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 31/03/26
Project: Research

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ATLAS Collaboration, Alderweireldt, S., Allen, J. F., Clark, P. J., Curran, J. R., Duda, D., Farrington, S. M., Gao, Y., Gargan, J. M., Gonzalez Andana, R. Y., Jiang, C., Soberi, M. F. M., Martin, V. J., Mijović, L., Parrish, V. A., Pender, E. A., Qiu, T., Silva, J. M., Sopio, A. L., ... Zaid, E. (2025). Combination of searches for singly produced vectorlike top quarks in pp collisions at s=13TeV with the ATLAS detector. Physical Review D, 111(1), 1-30. Article 012012. https://doi.org/10.1103/PhysRevD.111.012012

@article{7b99e6dcf9b44464a9779f1d5c919066,

title = "Combination of searches for singly produced vectorlike top quarks in pp collisions at s=13TeV with the ATLAS detector",

abstract = "A combination of searches for the single production of vectorlike top quarks (𝑇) is presented. These analyses are based on proton-proton collisions at √𝑠 =13 TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1. The 𝑇 decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a 𝑍 boson (𝑇 →𝐻⁡𝑡 and 𝑇→𝑍⁢𝑡). The individual searches used in the combination are differentiated by the number of leptons (𝑒, 𝜇) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, 𝜅, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.",

author = "{ATLAS Collaboration} and S. Alderweireldt and J.F. Allen and Clark, {P. J.} and J.R. Curran and D. Duda and Farrington, {S. M.} and Y. Gao and J.M. Gargan and {Gonzalez Andana}, R.Y. and C. Jiang and Soberi, {M. Firdaus M.} and Martin, {V. J.} and L. Mijovi{\'c} and V.A. Parrish and E.A. Pender and T. Qiu and J.M. Silva and A.L. Sopio and F. Ustuner and E.M. Villhauer and H. Watson and B.M. Wynne and Z. Xu and E. Zaid",

year = "2025",

month = jan,

day = "29",

doi = "10.1103/PhysRevD.111.012012",

language = "English",

volume = "111",

pages = "1--30",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "1",

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ATLAS Collaboration, Alderweireldt, S, Allen, JF, Clark, PJ, Curran, JR, Duda, D , Farrington, SM , Gao, Y, Gargan, JM, Gonzalez Andana, RY, Jiang, C, Soberi, MFM, Martin, VJ , Mijović, L, Parrish, VA, Pender, EA, Qiu, T , Silva, JM , Sopio, AL, Ustuner, F, Villhauer, EM, Watson, H , Wynne, BM , Xu, Z & Zaid, E 2025, 'Combination of searches for singly produced vectorlike top quarks in pp collisions at s=13TeV with the ATLAS detector', Physical Review D, vol. 111, no. 1, 012012, pp. 1-30. https://doi.org/10.1103/PhysRevD.111.012012

TY - JOUR

T1 - Combination of searches for singly produced vectorlike top quarks in pp collisions at s=13TeV with the ATLAS detector

AU - ATLAS Collaboration

AU - Alderweireldt, S.

AU - Allen, J.F.

AU - Clark, P. J.

AU - Curran, J.R.

AU - Duda, D.

AU - Farrington, S. M.

AU - Gao, Y.

AU - Gargan, J.M.

AU - Gonzalez Andana, R.Y.

AU - Jiang, C.

AU - Soberi, M. Firdaus M.

AU - Martin, V. J.

AU - Mijović, L.

AU - Parrish, V.A.

AU - Pender, E.A.

AU - Qiu, T.

AU - Silva, J.M.

AU - Sopio, A.L.

AU - Ustuner, F.

AU - Villhauer, E.M.

AU - Watson, H.

AU - Wynne, B.M.

AU - Xu, Z.

AU - Zaid, E.

PY - 2025/1/29

Y1 - 2025/1/29

N2 - A combination of searches for the single production of vectorlike top quarks (𝑇) is presented. These analyses are based on proton-proton collisions at √𝑠 =13 TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1. The 𝑇 decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a 𝑍 boson (𝑇 →𝐻⁡𝑡 and 𝑇→𝑍⁢𝑡). The individual searches used in the combination are differentiated by the number of leptons (𝑒, 𝜇) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, 𝜅, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.

AB - A combination of searches for the single production of vectorlike top quarks (𝑇) is presented. These analyses are based on proton-proton collisions at √𝑠 =13 TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1. The 𝑇 decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a 𝑍 boson (𝑇 →𝐻⁡𝑡 and 𝑇→𝑍⁢𝑡). The individual searches used in the combination are differentiated by the number of leptons (𝑒, 𝜇) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, 𝜅, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.

U2 - 10.1103/PhysRevD.111.012012

DO - 10.1103/PhysRevD.111.012012

M3 - Article

SN - 2470-0010

VL - 111

SP - 1

EP - 30

JO - Physical Review D

JF - Physical Review D

IS - 1

M1 - 012012

ER -

Combination of searches for singly produced vectorlike top quarks in pp collisions at s=13TeV with the ATLAS detector

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Upgrade of the ATLAS detector at the LHC (2023-26)

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

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