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Search for heavy particles decaying to pairs of top quarks using lepton-plus-jets events in proton–proton collisions at sqrt(s) = 13 TeV with the ATLAS detector
Sanmay Ganguly
Weizmann Institute Of Science
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A search for new heavy particles that decay into top-antitop quark pairs (tt ̄) is performed
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using data collected by the ATLAS detector at the Large Hadron Collider from proton-proton
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collisions at a centre-of-mass energy of 13 TeV. The integrated luminosity of the data sample
is 36.1fb−1. Events consistent with top-quark pair production are selected by requiring a
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single isolated charged lepton, missing transverse momentum, and jet activity compatible with
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a hadronic top-quark decay. Jets identified as likely to contain b-hadrons are used to further
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control the background from other Standard Model processes. The invariant mass spectrum
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of the candidate top-quark pairs is searched for excesses above the background expectation.
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No significant deviations from the Standard Model predictions are found. Exclusion limits
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are set on the production cross section times branching ratio for the production of hypothetical
Z′ bosons, Kaluza-Kein gluons, and Kaluza-Klein gravitons with subsequent decay into tt ̄