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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
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0002-8913-0981
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2016 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 94, no 3, 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
AMER PHYSICAL SOC , 2016. Vol. 94, no 3, 032006
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Physical Sciences
URN: urn:nbn:se:kth:diva-199079DOI: 10.1103/PhysRevD.94.032006ISI: 000381893100002OAI: diva2:1060230

QC 20161228

Available from: 2016-12-28 Created: 2016-12-28 Last updated: 2016-12-28Bibliographically approved

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Lund-Jensen, BengtSidebo, P. EdvinStrandberg, Jonas
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