Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton–proton collisions at √s = 13 TeV with the ATLAS detector

Abraham, N L, Allbrooke, B, Asquith, L, Cerri, A, Safarzadeh Samani, B, DeSanto, A, Salvatore, F, Shaw, K, Stevenson, T, Suruliz, K, Sutton, M, Vivarelli, I, The ATLAS Collaboration, and others, (2018) Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton–proton collisions at √s = 13 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 78 (7). a565. ISSN 1434-6044

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Abstract

A search for new heavy particles that decay into top-quark pairs is performed using data collected from proton–proton collisions at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The integrated luminosity of the data sample is 36.1 fb−1. Events consistent with top-quark pair production are selected by requiring a single isolated charged lepton, missing transverse momentum and jet activity compatible with a hadronic top-quark decay. Jets identified as likely to contain b-hadrons are required to reduce the background from other Standard Model processes. The invariant mass spectrum of the candidate top-quark pairs is examined for local excesses above the background expectation. No significant deviations from the Standard Model predictions are found. Exclusion limits are set on the production cross-section times branching ratio for hypothetical Z bosons, Kaluza–Kein gluons and Kaluza–Klein gravitons that decay into top-quark pairs.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Amelia Redman
Date Deposited: 28 Aug 2019 15:55
Last Modified: 29 Aug 2019 11:15
URI: http://sro.sussex.ac.uk/id/eprint/85619

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