Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 37: Search for New Particles II
T 37.5: Vortrag
Dienstag, 16. März 2021, 17:00–17:15, Tl
Search for new particles in events with four top quarks at the ATLAS detector — •Alicia Wongel1, Krisztian Peters1, Philipp Gadow1, Xingguo Li1, Christopher Pollard1, James Ferrando1, Loic Valery1, Nedaa-Alexandra Asbah2, Elise Le Boulicaut3, Mark Kruse3, Ashutosh Kotwal3, Katherine Pachal3, Sourav Sen3, Samuel Calvet4, William Barbe4, Qin Yang5, and Masahiro Morii2 — 1DESY Hamburg — 2Harvard University — 3Duke University, Department of Physics — 4Laboratoire de Physique de Clermont-Ferrand (LPC), Universite Clermont Auvergne — 5University of Manchester
A novel search for anomalous production of four-top-quark events is presented. It offers a unique way to probe top-philic resonances (Z′) which can only be produced in association with top quarks (ttZ′ → tttt) and thus are inaccessible by conventional searches. The Run 2 LHC proton-proton collision data recorded with the ATLAS detector is used in the search to select events with exactly one reconstructed lepton. This selection ensures high signal acceptance while suppressing multijet process events. Furthermore, the particular configuration where the resonance decays fully hadronically is investigated. A potential signal would manifest itself as a localized excess over the steeply falling mass spectrum of the two top quarks with the highest momentum which are reconstructed in their hadronic decay mode (mtt). In this talk, an overview of the analysis strategy is given, highlighting the data-driven background estimation.