Speaker
Summary
A measurement of the top quark pair (tt) production charge asymmetry Ac
using 4.7 fb-1 of proton-proton collisions at a centre-of-mass energy
of 7 TeV collected by the ATLAS detector at the LHC is presented.
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.
The measured value of the tt production charge asymmetry is 0.006 +/- 0.010,
where the uncertainty includes both the statistical and the systematic
components. Differential Ac measurements as a function of the invariant
mass, the rapidity and the transverse momentum of the tt-system are also
presented. In addition, Ac 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.
