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

ATLAS Collaboration

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    In the pp→tt¯ 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 s=8TeV 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 (mtt¯>0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within −2<|yt|−|y|<2 is measured to be 4.2±3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt¯ mass bins is also presented.

    Original languageEnglish
    Pages (from-to)52-71
    Number of pages20
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume756
    DOIs
    Publication statusPublished - 2016 May 10

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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