Determination of W -boson Properties at Hadron Colliders

Methods for measuring the W -boson properties at hadron colliders are discussed. It is demonstrated that the ratio between the W and Z-boson observables can be reliably calculated using perturbative QCD, even when the individual W and Z-boson observables are not. Hence, by using a measured Zboson observable and the perturbative calculation of the ratio of the W over Z-boson observable, we can accurately predict the W -boson observable. The use of the ratio reduces both the experimental and theoretical systematic uncertainties substantially. Compared to the currently used methods it might, at high luminosity, result in a smaller overall uncertainty on the measured W -boson mass and width.