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Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at root s=8 TeV with the ATLAS detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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2016 (English)In: Physical Review D, ISSN 2470-0010, Vol. 94, no 3, article id 032006Article in journal (Refereed) Published
Abstract [en]

Measurements of the top-antitop quark pair production charge asymmetry in the dilepton channel, characterized by two high-p(T) leptons (electrons or muons), are presented using data corresponding to an integrated luminosity of 20.3 fb(-1) from pp collisions at a center-of-mass energy root s = 8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. Inclusive and differential measurements as a function of the invariant mass, transverse momentum, and longitudinal boost of the tt system arc performed both in the full phase space and in a fiducial phase space closely matching the detector acceptance. Two observables are studied: A(c)(ll) based on the selected leptons and A(c)(tt) based on the reconstructed tt final state. The inclusive asymmetries are measured in the full phase space to be A(c)(ll)= 0.008 +/- 0.006 and A(c)(tt)= 0.021 +/- 0.016, which are in agreement with the Standard Model predictions of A(c)(ll)= 0.0064 +/- 0.0003 and A(c)(tt)= 0.0111 +/- 0.0004.

Place, publisher, year, edition, pages
2016. Vol. 94, no 3, article id 032006
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:uu:diva-312813DOI: 10.1103/PhysRevD.94.032006ISI: 000381893100002OAI: oai:DiVA.org:uu-312813DiVA, id: diva2:1064827
Note

ATLAS Collaboration, for complete list of authors see https://doi.org/10.1103/PhysRevD.94.032006

Available from: 2017-01-13 Created: 2017-01-13 Last updated: 2017-01-13Bibliographically approved

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