prospects of measuring ZZ and WZ polarization with ATLAS detector

The prospects are presented for measuring the longitudinal polarization fraction of the W and Z boson in WZ and ZZ production at the LHC, using the ATLAS detector. The analysis uses fully simulated samples, with integrated luminosity of 100 fb^{-1}, to estimate the background contamination, and to test the procedure of extracting the gauge boson polarization fraction from the angular distribution of their decay products. The systematic uncertainties from detector coverage correction and proton parton distribution function are evaluated.