A study of the role of the PDF uncertainty on the LHC W-boson mass measurement
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 work, 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 $$P^{W}_{T}$$ < 15 GeV and 35 < $$P^{l}_{T}$$ (GeV) < 45, PDF uncertainties lead (at the 68% CL) to a mass uncertainty for the $$M^{+}_{W}$$ of $$^{+16.0}_{-17.5}$$ MeV, $$^{+13.9}_{-14.8}$$ MeV, and $$^{+12.2}_{-19.2}$$ MeV, are determined at 7 TeV, 8 TeV and 13 TeV, respectively. The uncertainties of $$M^{-}_{W}$$ for the same cuts are found to be $$^{+15.9}_{-15.6}$$ MeV, $$^{+15.0}_{-12.7}$$ MeV and $$^{+14.8}_{-15.3}$$ MeV at 7 TeV, 8 TeV and 13 TeV, respectively.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1545088
- Alternate ID(s):
- OSTI ID: 22899655
- Report Number(s):
- arXiv:1905.00110; FERMILAB-PUB-19-185-T; oai:inspirehep.net:1732508
- Journal Information:
- Journal of Physics. G, Nuclear and Particle Physics, Journal Name: Journal of Physics. G, Nuclear and Particle Physics Journal Issue: 9 Vol. 46; ISSN 0954-3899
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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