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
dc.contributor.author | Aad, G. | |
dc.contributor.author | Abbott, B. | |
dc.contributor.author | Abbott, D.C. | |
dc.contributor.author | Abed Abud, A. | |
dc.contributor.author | Abeling, K. | |
dc.contributor.author | Abhayasinghe, D.K. | |
dc.contributor.author | Abidi, S.H. | |
dc.contributor.author | Abramowicz, H. | |
dc.contributor.author | Abreu, H. | |
dc.contributor.author | Abulaiti, Y. | |
dc.contributor.author | Abusleme Hoffman, A.C. | |
dc.contributor.author | Acharya, B.S. | |
dc.contributor.author | Achkar, B. | |
dc.contributor.author | Adam, L. | |
dc.contributor.author | Adam Bourdarios, C. | |
dc.contributor.author | Adamczyk, L. | |
dc.contributor.author | Adamek, L. | |
dc.contributor.author | Addepalli, S.V. | |
dc.contributor.author | Adelman, J. | |
dc.contributor.author | Adiguzel, A. | |
dc.contributor.author | et al. | |
dc.date.issued | 2023 | |
dc.description.abstract | 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 √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 → Z t 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. | |
dc.description.statementofresponsibility | The Atlas Collaboration … G. Aad … E. K. Filmer … P. Jackson ... A.X.Y. Kong … H. Potti … E.X.L. Ting … M. J. White … et al. | |
dc.identifier.citation | Physics Letters B, 2023; 843:138019-1-138019-25 | |
dc.identifier.doi | 10.1016/j.physletb.2023.138019 | |
dc.identifier.issn | 0370-2693 | |
dc.identifier.issn | 1873-2445 | |
dc.identifier.orcid | Jackson, P. [0000-0002-0847-402X] | |
dc.identifier.orcid | Kong, A.X.Y. [0000-0001-8063-8765] | |
dc.identifier.orcid | McDougall, A.E. [0000-0001-7713-2800] | |
dc.identifier.orcid | Oliver, J.L. [0000-0002-0713-6627] | |
dc.identifier.orcid | Potti, H. [0000-0002-0800-9902] | |
dc.identifier.orcid | Ruggeri, T.A. [0000-0001-9941-1966] | |
dc.identifier.orcid | White, M.J. [0000-0001-5474-4580] | |
dc.identifier.uri | https://hdl.handle.net/2440/140244 | |
dc.language.iso | en | |
dc.publisher | Elsevier BV | |
dc.relation.grant | ARC | |
dc.rights | © 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. | |
dc.source.uri | https://doi.org/10.1016/j.physletb.2023.138019 | |
dc.subject | vector-like quarks | |
dc.title | 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 | |
dc.type | Journal article | |
pubs.publication-status | Published |
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