Measurement of the forward-backward asymmetry of electron and muon pair-production in pp collisions at (Formula Presented.) = 7 TeV with the ATLAS detector

The ATLAS Collaboration

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    Abstract

    This paper presents measurements from the ATLAS experiment of the forward-backward asymmetry in the reaction pp → Z/γ* → l+l, with l being electrons or muons, and the extraction of the effective weak mixing angle. The results are based on the full set of data collected in 2011 in pp collisions at the LHC at (Formula presented.), corresponding to an integrated luminosity of 4.8 fb−1. The measured asymmetry values are found to be in agreement with the corresponding Standard Model predictions. The combination of the muon and electron channels yields a value of the effective weak mixing angle of sin2θefflept = 0.2308 ± 0.0005(stat.) ± 0.0006(syst.) ± 0.0009(PDF), where the first uncertainty corresponds to data statistics, the second to systematic effects and the third to knowledge of the parton density functions. This result agrees with the current world average from the Particle Data Group fit.

    Original languageEnglish
    Article number49
    JournalJournal of High Energy Physics
    Volume2015
    Issue number9
    DOIs
    Publication statusPublished - 2015 Sep 26

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    Keywords

    • Hadron-Hadron Scattering

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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