Effect of flavor-dependent partonic transverse momentum on the determination of the W mass at hadron colliders

We explore the impact of a flavor-dependent intrinsic transverse momentum of quarks on the pro- duction of W ± bosons in proton-proton collisions at hadron colliders. We build a template fit to the transverse-mass and the lepton transverse-momentum distributions of the W decay products. We estimate the shift in the extracted value of the W mass induced by different choices of flavor- dependent parameters for the quark intrinsic transverse momentum, that all reproduce the same transverse-momentum distribution of the Z boson. Our findings call for more detailed investiga- tions of nonperturbative effects, which might affect very precise determinations of some Standard Model parameters even at kinematics where these effects are expected to be small.