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Inclusive and differential cross-sections for the production of a top-quarkpair in association with a photon are measured with proton-proton collisiondata corresponding to an integrated luminosity of 36.1 fb$^{-1}$, collected bythe ATLAS detector at the LHC in 2015 and 2016 at a centre-of-mass energy of 13TeV. The measurements are performed in single-lepton and dilepton final statesin a fiducial volume. Events with exactly one photon, one or two leptons, achannel-dependent minimum number of jets, and at least one $b$-jet areselected. Neural network algorithms are used to separate the signal from thebackgrounds. The fiducial cross-sections are measured to be 521 $\pm$ 9(stat.)$\pm$ 41(sys.) fb and 69 $\pm$ 3(stat.) $\pm$ 4(sys.) fb for the single-leptonand dilepton channels, respectively. The differential cross-sections aremeasured as a function of photon transverse momentum, photon absolutepseudorapidity, and angular distance between the photon and its closest leptonin both channels, as well as azimuthal opening angle and absolutepseudorapidity difference between the two leptons in the dilepton channel. Allmeasurements are in agreement with the theoretical predictions.

european physical journal. c, particles and fields

Measurements of inclusive and differential fiducial cross-sections of  $t\bar{t}\gamma$ production in leptonic final states at $\sqrt{s}$ = 13 TeV  in ATLAS