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

• Autores: Alconada Verzini, María Josefina; Alonso, Francisco; Arduh, Francisco Anuar; Dova, María Teresa; Monticelli, Fernando Gabriel; Wahlberg, Hernán Pablo; The ATLAS Collaboration
• Año de publicación: 2016
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas; Física; proton-proton collisions; ATLAS detector
• Institución: Universidad Nacional de La Plata

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 √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 are performed both in the full phase space and in a fiducial phase space closely matching the detector acceptance. Two observables are studied: A^ℓℓ_C based on the selected leptons and ACtt based on the reconstructed tt final state. The inclusive asymmetries are measured in the full phase space to be A^ℓℓ_C=0.008±0.006 and A^tt_C=0.021±0.016, which are in agreement with the Standard Model predictions of A^ℓℓ_C=0.0064±0.0003 and A^tt_C=0.0111±0.0004.
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Facultad de Ciencias Exactas
Instituto de Física La Plata