학술논문
Search for top-philic heavy resonances in pp collisions at s=13 TeV with the ATLAS detector.
Document Type
Article
Author
ATLAS Collaboration; Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme Hoffman, A. C.; Acharya, B. S.; Adam Bourdarios, C.; Adamczyk, L.; Adamek, L.; Addepalli, S. V.; Addison, M. J.; Adelman, J.; Adiguzel, A.; Adorni, S.
Source
Subject
*PROTON-proton interactions
*LARGE Hadron Collider
*RESONANCE
*TOP quarks
*BRANCHING ratios
*Z bosons
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Language
ISSN
1434-6044
Abstract
A search for the associated production of a heavy resonance with a top-quark or a top-antitop-quark pair, and decaying into a t t ¯ pair is presented. The search uses the data recorded by the ATLAS detector in pp collisions at s = 13 TeV at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 139 fb - 1 . Events containing exactly one electron or muon are selected. The two hadronically decaying top quarks from the resonance decay are reconstructed using jets clustered with a large radius parameter of R = 1 . The invariant mass spectrum of the two top quark candidates is used to search for a resonance signal in the range of 1.0 TeV to 3.2 TeV . The presence of a signal is examined using an approach with minimal model dependence followed by a model-dependent interpretation. No significant excess is observed over the background expectation. Upper limits on the production cross section times branching ratio at 95% confidence level are provided for a heavy Z ′ boson based on a simplified model, for Z ′ mass between 1.0 TeV and 3.0 TeV . The observed (expected) limits range from 21 (14) fb to 119 (86) fb depending on the choice of model parameters. [ABSTRACT FROM AUTHOR]