Speaker
Description
With the goal of increasing the precision of NLO QCD predictions for the $pp\rightarrow t\overline{t}\gamma$ process in the di-lepton top quark decay channel we present a study of the ratio of top quarks together with a photon to the top quark pair. Fully realistic LO and NLO computations for $t\overline{t}\gamma$ and $t\overline{t}$ production are employed. Events with exactly one electron and one muon, and at least two jets with one of them being a $b$-tagged are selected. Multiple observables are related with Monte Carlo simulations at leading-order and next-to-leading-order theoretical calculations. The variables include photon kinematic variables, angular separation between the two leptons, and angular variables related to the photon and the leptons.
