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Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector

AuthorsAad, G.; Cabrera, Susana ; Castillo, Mª Victoria ; Costa, María José ; Fassi, F. ; Ferrer, Antonio ; Fiorini, L. ; Fuster, Juan ; García Navarro, José Enrique ; González de la Hoz, Santiago ; Hernández Jiménez, Yesenia ; Higón, Emilio ; Irles Quiles, Adrián ; Kaci, Mohamed ; Lacasta Llácer, Carlos ; Lacuesta, Vicente ; March, Luis ; Martí García, Salvador ; Miñano, Mercedes ; Mitsou, Vasiliki A. ; Moles Valls, Regina ; Moreno Llácer, María ; Oliver García, Elena ; Pedraza López, Sebastián ; Romero Adam, E. ; Ros, Eduardo ; Salt, José ; Sánchez Martínez, Victoria ; Soldevila, Urmila ; Torró Pastor, Emma ; Valero, Alberto ; Valladolid Gallego, Eva ; Valls Ferrer, Juan Antonio ; Villaplana Pérez, Miguel ; Vos, Marcel ; Pérez García-Estañ, María Teresa ; ATLAS Collaboration
KeywordsHadron-Hadron Scattering
Top physics
Issue Date25-Feb-2014
CitationJournal of High Energy Physics 2014:107 (2014)
AbstractThis paper presents a measurement of the top quark pair ( tt¯ ) production charge asymmetry A C using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy s√ = 7 TeV collected by the ATLAS detector at the LHC. A tt¯ -enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the tt¯ event kinematics. A Bayesian unfolding procedure is employed to estimate A C at the parton-level. The measured value of the tt¯ production charge asymmetry is A C = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential A C measurements as a function of the invariant mass, the rapidity and the transverse momentum of the tt¯ system are also presented. In addition, A C is measured for a subset of events with large tt¯ velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
DescriptionAad, G. et al.
Publisher version (URL)http://dx.doi.org/10.1007/JHEP02(2014)107
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