The W boson mass is extracted from a template fit to the transverse mass, transverse momentum
and transverse missing energy distribution. We use a fast Monte Carlo simulation to
predict the lineshape of the template distribution.
These lineshape predictions depend on a number of physics and detector
effects which we constrain from control samples or simulation.
Important detector effects include external bremsstrahlung and ionization energy loss
in the detector material, tracker momentum scale, calorimeter energy
scale and resolutions of both detectors.
Important physics effects include internal QED radiation, the intrinsic W boson
transverse momentum and the proton parton distribution functions.
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