Single Photon studies in ATLAS with Run 2 dataset

We present a performance study of photon reconstruction within the Higgs working group of the ATLAS experiment. The analysis use a data sample of proton-proton collisions at center-of-mass energy of $\sqrt{s} = 13~TeV$, recorded with the ATLAS detector at the LHC in 2015+2016, corresponding to a total integrated luminosity of 14.5 $fb^{-1}$ (at the moment). The performance of electron and photon reconstruction plays a critical role in the reach of many analysis, including $H\rightarrow \gamma \gamma$ and $H\rightarrow 4l$ concerning Higgs searches. This work is a study of single photon conversions with the ATLAS detector.