Prospects of measuring ZZ polarization in the ATLAS detector

Prospect of measuring the spin density element, $\rho_{00}$, of the $Z$ boson in $q\overline{q} \rightarrow ZZ \rightarrow$ 4 leptons (muons and electrons) events in ATLAS is presented. This is done through reconstructing the decay angle of the leptons in the $Z$ rest frame. The fraction of the longitudinal polarized $Z$'s is extracted from the angular distribution. The errors presented correspond to an integrated luminosity of a 100$\rm{fb^{-1}}$. The final error on the prospect measurement includes the error due to detector correction and also to some systematics uncertainties due to the proton structure function.