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Measurements of normalized differential cross-sections of top quark pair($t\bar t$) production are presented as a function of the mass, the transversemomentum and the rapidity of the $t\bar t$ system in proton-proton collisionsat center-of-mass energies of $\sqrt{s}$ = 7 TeV and 8 TeV. The datasetcorresponds to an integrated luminosity of 4.6 fb$^{-1}$ at 7 TeV and 20.2fb$^{-1}$ at 8 TeV, recorded with the ATLAS detector at the Large HadronCollider. Events with top quark pair signatures are selected in the dileptonfinal state, requiring exactly two charged leptons and at least two jets withat least one of the jets identified as likely to contain a $b$-hadron. Themeasured distributions are corrected for detector effects and selectionefficiency to cross-sections at the parton level. The differentialcross-sections are compared with different Monte Carlo generators andtheoretical calculations of $t\bar t$ production. The results are consistentwith the majority of predictions in a wide kinematic range.

Measurement of top quark pair differential cross-sections in the dilepton channel in $pp$ collisions at $\sqrt{s} =$ 7 and 8\,TeV with ATLAS