Template Fit Studies for tt¯+ c cross section measurement analysis using the ATLAS Detector

A strategy of the tt¯ production with additional c-quark jets in the dilepton channel is presented using the LHC proton-proton collision data at the center-of-mass energy √ s = 13 T eV collected with the ATLAS detector at the LHC. The dataset corresponds with an integrated luminosity of 139 fb^-1 . Events with exactly one electron, exactly one muon, at least three jets in the final state and with at least two jets containing b-hadrons, are used to determine the tt¯+ c production cross section through a template fit. In this presentation, the performance of the method using template fits is discussed.