Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at √s=8 TeV with the ATLAS detector

Aad, G.; Abbott, B.; Abdallah, J.; Adomeit, Stefanie und Bender, M. (2016): Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at √s=8 TeV with the ATLAS detector. In: Physical Review D, Bd. 94, Nr. 3, 32006

Abstract

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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2470-0010
• Bemerkung: Vollständige Autorenliste siehe Verlagsseite bzw. PDF
• Sprache: Englisch