Study of $$Z \rightarrow ll\gamma $$ Z → l l γ decays at $$\sqrt{s}$$ s = 8 TeV with the ATLAS detector

Abstract

Abstract This paper presents a study of

$$Z \rightarrow ll\gamma $$

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

$$\sqrt{s}$$

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

$$Z \rightarrow ll\gamma \gamma $$

Z → l l γ γ

decays are also reported.