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Measurements of top quark spin observables in $t\bar{t}$ events are presentedbased on 20.2 fb$^{-1}$ of $\sqrt{s} = 8$ TeV proton-proton collisions recordedwith the ATLAS detector at the LHC. The analysis is performed in the dileptonfinal state, characterised by the presence of two isolated leptons (electronsor muons). There are 15 observables, each sensitive to a different coefficientof the spin density matrix of $t\bar{t}$ production, which are measuredindependently. Ten of these observables are measured for the first time. All ofthem are corrected for detector resolution and acceptance effects back to theparton and stable-particle levels. The measured values of the observables atparton level are compared to Standard Model predictions at next-to-leadingorder in QCD. The corrected distributions at stable-particle level arepresented and the means of the distributions are compared to Monte Carlopredictions. No significant deviation from the Standard Model is observed forany observable.

the journal of high energy physics/the journal of high energy physics

Measurements of top quark spin observables in $t\bar{t}$ events using  dilepton final states in $\sqrt{s} = 8$ TeV $pp$ collisions with the ATLAS  detector