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

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dc.contributor.authorAad G.
dc.contributor.authorATLAS Collaboration
dc.contributor.authorS. Kuleshov
dc.date.accessioned2025-01-02T20:18:39Z
dc.date.available2025-01-02T20:18:39Z
dc.date.issued2023
dc.descriptionIndexación: Scopus
dc.description.abstractA 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 139fb−1 of pp collisions at s=13TeV, 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>1.60TeV and mB>1.42TeV, respectively. © 2023 The Author(s)
dc.description.urihttps://www-sciencedirect-com.recursosbiblioteca.unab.cl/science/article/pii/S0370269323003532?via%3Dihub
dc.identifier.citationPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. Open Access. Volume 843. 10 August 2023. Article number 138019
dc.identifier.doi10.1016/j.physletb.2023.138019
dc.identifier.issn0370-2693
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/62889
dc.language.isoen
dc.publisherElsevier B.V.
dc.rights.licenseAttribution 4.0 International Deed (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectLarge Hadron Collider
dc.subjectATLAS detector
dc.subjectZ Boson
dc.subjectSame-Flavour Leptons
dc.subjectCollision Events at s=13 TeV
dc.subjectStandard Model quark
dc.titleSearch 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.typeArtículo
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