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Abstract This paper presents a study of Z ll Z → l l γ decays with the ATLAS detector at the Large Hadron Collider. The analysis uses a proton–proton data sample corresponding to an integrated luminosity of 20. 2 fb ^-1 - 1 collected at a centre-of-mass energy s s = 8 TeV. Integrated fiducial cross-sections together with normalised differential fiducial cross-sections, sensitive to the kinematics of final-state QED radiation, are obtained. The results are found to be in agreement with state-of-the-art predictions for final-state QED radiation. First measurements of Z ll Z → l l γ γ decays are also reported.
Aad et al. (Mon,) studied this question.