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Within the framework of transverse-momentum-dependent factorization, weinvestigate for the first time the impact of a flavor-dependent intrinsictransverse momentum of quarks on the production of $W^{\pm}$ bosons inproton-proton collisions at $\sqrt{s}$ = 7 TeV. We estimate the shift in theextracted value of the $W$ boson mass $M_W$ induced by different choices offlavor-dependent parameters for the intrinsic quark transverse momentum bymeans of a template fit to the transverse-mass and the leptontransverse-momentum distributions of the $W$-decay products. We obtain $-6\leq\Delta M_{W^+} \leq 9$ MeV and $-4\leq \Delta M_{W^-} \leq 3$ MeV with astatistical uncertainty of $\pm 2.5$ MeV. Our findings call for more detailedinvestigations of flavor-dependent nonperturbative effects linked to the protonstructure at hadron colliders.

Effect of flavor-dependent partonic transverse momentum on the determination of the $W$ boson mass in hadronic collisions