Preprint/Internal Report

PUBDB-2014-03748

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Estimation of non-prompt and fake lepton backgrounds in final states with top quarks produced in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

ATLAS Collaboration (Collaboration author)DESY*

2014

Report No.: ATLAS-CONF-2014-058

Abstract: The differential cross-section for boosted top quark pair production is measured in 20.3~\ifb\ of proton-proton collisions at a center-of-mass energy of 8 TeV. The measurement is performed for \ttbar events in the lepton+jets channel, where the hadronically decaying top quark has a transverse momentum above 300 GeV, and is reported as a function of the hadronically decaying top quark transverse momentum. Jet substructure techniques are employed to identify top quarks, which are reconstructed with an anti-k t jet with radius parameter R=1.0 . The observed yield is corrected for detector effects to obtain a cross-section at particle-level in a fiducial region close to the event selection. A parton-level cross-section extrapolated to the full phase-space is also reported for top quarks with transverse momentum above 300 GeV. The predictions of next-to-leading-order and leading-order matrix element plus parton shower Monte Carlo generators are found to generally overestimate the measured cross-sections.

Note: Imprint: 30 Sep 2014; Copyright 2014 CERN for the benefit of the ATLAS Collaboration.

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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. Experiments at LHC (ATLAS) (POF2-512) (POF2-512)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2014

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