Search for new particles in fnal states with a boosted top quark and missing transverse momentum in proton-proton collisions at √s = 13 TeV with the ATLAS detector
department or school: Science, Faculty of
department or school: TRIUMF
department or school: Non UBC
department or school: Physics and Astronomy, Department of
data provider: DSpace
identifier citation: Journal of High Energy Physics. 2024 May 23;2024(5):263
rights copyright: The Author(s)
creator: ATLAS Collaboration
issued: 2024-10-24T22:42:38Z
issued: 2024-05-23
description: A search for events with one top quark and missing transverse momentum in the fnal state is presented. The fully hadronic decay of the top quark is explored by selecting events with a reconstructed boosted top-quark topology produced in association with large missing transverse momentum. The analysis uses 139 fb−1 of proton-proton collision data at a centre-of-mass energy of √ s = 13 TeV recorded during 2015-2018 by the ATLAS detector at the Large Hadron Collider. The results are interpreted in the context of simplifed models for Dark Matter particle production and the single production of a vector-like T quark. Without signifcant excess relative to the Standard Model expectations, 95% confdence-level upper limits on the corresponding cross-sections are obtained. The production of Dark Matter particles in association with a single top quark is excluded for masses of a scalar (vector) mediator up to 4.3 (2.3) TeV, assuming mχ = 1 GeV and the model couplings λq = 0.6 and λχ = 0.4 (a = 0.5 and gχ = 1). The production of a single vector-like T quark is excluded for masses below 1.8 TeV assuming a coupling to the top quark κT = 0.5 and a branching ratio for T → Zt of 25%.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/89519
note: JHEP05(2024)263PuAlished for SISS Ay SpringerReceived: February 27, 2024Accepted: May 5, 2024Published: May 23, 2024Search for new particles in final states with a boostedtop quark and missing transverse momentum inproton-proton collisions at √s = 13TeV with theATLAS detectorThe ATLAS collaborationE-mail: atlas.publications@cern.chAbstract: A search for events with one top quark and missing transverse momentum in thefinal state is presented. The fully hadronic decay of the top quark is explored by selectingevents with a reconstructed boosted top-quark topology produced in association with largemissing transverse momentum. The analysis uses 139 fb−1 of proton-proton collision data ata centre-of-mass energy of√s = 13TeV recorded during 2015-2018 by the ATLAS detector atthe Large Hadron Collider. The results are interpreted in the context of simplified models forDark Matter particle production and the single production of a vector-like T quark. Withoutsignificant excess relative to the Standard Model expectations, 95% confidence-level upperlimits on the corresponding cross-sections are obtained. The production of Dark Matterparticles in association with a single top quark is excluded for masses of a scalar (vector)mediator up to 4.3 (2.3)TeV, assuming mχ = 1GeV and the model couplings λq = 0.6and λχ = 0.4 (a = 0.5 and gχ = 1). The production of a single vector-like T quark isexcluded for masses below 1.8TeV assuming a coupling to the top quark κT = 0.5 and abranching ratio for T → Zt of 25%.Keywords: Hadron-Hadron ScatteringArXiv ePrint: 2402.16561Open Access, © The Authors.Article funded by SCOAP3. https://doi.org/10.1007/JHEP05(2024)263JHEP05(2024)263Contents1 Introduction 12 Signal phenomenology 32.1 Dark Matter production in association with top quarks 42.2 Production of a single vector-like T quark 43 ATLAS detector 54 Data and simulated samples 65 Event reconstruction and object selection 96 Event selection and background estimate 106.1 Signal region definition 1…
has type: Article
is shown at: 10.14288/1.0447107
language: eng
peer review status: Reviewed
provider: Vancouver : University of British Columbia Library
publisher: Springer Berlin Heidelberg
publisher DOI: 10.1007/JHEP05(2024)263
rights: Attribution 4.0 International (CC BY 4.0)
rights URI: http://creativecommons.org/licenses/by/4.0/
scholar level: Faculty
subject: Hadron-Hadron Scattering
type: Text
identifier URI: http://hdl.handle.net/2429/89519