Journal of High Energy Physics > 2014 > 2014 > 2 > 1-38
Measurement of the top quark pair production charge asymmetry in proton-proton collisions at = 7 TeV using the ATLAS detector
Source
Abstract
This paper presents a measurement of the top quark pair ( ) production charge asymmetry A C using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy = 7 TeV collected by the ATLAS detector at the LHC. A -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 event kinematics. A Bayesian unfolding procedure is employed to estimate A C at the parton-level. The measured value of the 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 system are also presented. In addition, A C is measured for a subset of events with large velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
Identifiers
journal e-ISSN : | 1029-8479 |
DOI | 10.1007/JHEP02(2014)107 |
Authors
B. Abbott
- University of Oklahoma, Homer L. Dodge Department of Physics and Astronomy, Norman, United States of America