Measuring WZ longitudinal polarization with the ATLAS detector

The prospects are presented for measuring, in ATLAS, the spin density element, ρ00, of the Z and W bosons in WZ production. The analysis considers events where both W and Z decay leptonically via electron or muon channels. This is done by reconstructing the decay angle of the leptons in the Z and W rest frames. The fraction of longitudinally polarized Z’s and W ’s are extracted from the angular distributions. The errors presented correspond to an integrated luminosity of 100 fb−1. The expected final error on the measurement includes the systematic error due to detector correction and also due to the choice of proton parton distribution function.