  Measurements are presented of differential cross-sections for top quark pair
production in pp collisions at sqrt(s) = 7 TeV relative to the total inclusive
top quark pair production cross-section. A data sample of 2.05/fb recorded by
the ATLAS detector at the Large Hadron Collider is used. Relative differential
cross-sections are derived as a function of the invariant mass, the transverse
momentum and the rapidity of the top quark pair system. Events are selected in
the lepton (electron or muon) + jets channel. The background-subtracted
differential distributions are corrected for detector effects, normalized to
the total inclusive top quark pair production cross-section and compared to
theoretical predictions. The measurement uncertainties range typically between
10% and 20% and are generally dominated by systematic effects. No significant
deviations from the Standard Model expectations are observed.
