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Title: A study of the role of the PDF uncertainty on the LHC W-boson mass measurement

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 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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Univ. of Jordan, Amman (Jordan). Dept. of Physics
  2. Fermilab, Batavia, IL (United States). Theoretical Physics Dept.
  3. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1545088
Report Number(s):
arXiv:1905.00110; FERMILAB-PUB-19-185-T
Journal ID: ISSN 0954-3899; oai:inspirehep.net:1732508
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. G, Nuclear and Particle Physics
Additional Journal Information:
Journal Volume: 46; Journal Issue: 9; Journal ID: ISSN 0954-3899
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; W-boson mass; standard model; parton distribution functions; LHC

Citation Formats

Hussein, Moh’d, Isaacson, Joshua, and Huston, Joey. A study of the role of the PDF uncertainty on the LHC W-boson mass measurement. United States: N. p., 2019. Web. doi:10.1088/1361-6471/ab2e5d.
Hussein, Moh’d, Isaacson, Joshua, & Huston, Joey. A study of the role of the PDF uncertainty on the LHC W-boson mass measurement. United States. doi:10.1088/1361-6471/ab2e5d.
Hussein, Moh’d, Isaacson, Joshua, and Huston, Joey. Wed . "A study of the role of the PDF uncertainty on the LHC W-boson mass measurement". United States. doi:10.1088/1361-6471/ab2e5d.
@article{osti_1545088,
title = {A study of the role of the PDF uncertainty on the LHC W-boson mass measurement},
author = {Hussein, Moh’d and Isaacson, Joshua and Huston, Joey},
abstractNote = {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.},
doi = {10.1088/1361-6471/ab2e5d},
journal = {Journal of Physics. G, Nuclear and Particle Physics},
number = 9,
volume = 46,
place = {United States},
year = {2019},
month = {8}
}

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