Search for new particles in final states with a boosted top quark and missing transverse momentum in proton-proton collisions at √s=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abeling, K, Abicht, NJ, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS
et al (show 2924 more authors) (2024) Search for new particles in final states with a boosted top quark and missing transverse momentum in proton-proton collisions at √s=13 TeV with the ATLAS detector JOURNAL OF HIGH ENERGY PHYSICS, 2024 (5). 263-. ISSN 1126-6708, 1029-8479

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Abstract

A search for events with one top quark and missing transverse momentum in the final 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 simplified models for Dark Matter particle production and the single production of a vector-like T quark. Without significant excess relative to the Standard Model expectations, 95% confidence-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 m<inf>χ</inf> = 1 GeV and the model couplings λ<inf>q</inf> = 0.6 and λ<inf>χ</inf> = 0.4 (a = 0.5 and g<inf>χ</inf> = 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 κ<inf>T</inf> = 0.5 and a branching ratio for T → Zt of 25%.

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron Scattering
Depositing User: Symplectic Admin
Date Deposited: 01 Jul 2024 09:30
Last Modified: 23 May 2026 08:51
DOI: 10.1007/JHEP05(2024)263
Open Access URL: https://link.springer.com/article/10.1007/JHEP05(2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3182564
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