Abstract
The determination of the W-boson mass through an analysis of the decay charged-lepton transverse momentum distribution has a sizable uncertainty due to the imperfect knowledge of the relevant parton distribution functions (PDFs). In this paper, a quantitative assessment of the W-boson mass uncertainty at the LHC resulting from the PDF uncertainty is examined. We use the CT14 NNLO PDFs with a NNLL + NNLO calculation (ResBos) to simulate the W-boson production and decay kinematics. The uncertainty of the W-boson mass determination is then determined as a function of the boson and lepton kinematics. For W+ production using and (GeV) < 45, PDF uncertainties lead (at the 68% CL) to a mass uncertainty for the of MeV, MeV, and MeV, are determined at 7 TeV, 8 TeV and 13 TeV, respectively. The uncertainties of for the same cuts are found to be MeV, MeV and MeV, at 7 TeV, 8 TeV and 13 TeV, respectively.
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