Measurement of the charge asymmetry in highly boosted top-quark pair production in √s=8TeV pp collision data collected by the ATLAS experiment

ATLAS Collaboration

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Abstract

In the $pp \rightarrow t\bar{t}$ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} =$ 8 TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair ($m_{t\bar{t}} > $ 0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within $-$2 $
Original languageEnglish
Pages (from-to)52–71
JournalPhysics Letters B
Volume756
Early online date2 Mar 2016
DOIs
Publication statusPublished - 10 May 2016

Bibliographical note

19 pages plus author list (36 pages total), 3 figures, 2 tables. Submitted to Physics Letters B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-10/

Keywords

  • hep-ex

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