Compatibility of Neutrino DIS Data and Its Impact on Nuclear Parton Distribution Functions
arxiv(2022)
Abstract
In global analyses of nuclear parton distribution functions (nPDFs), neutrino
deep-inelastic scattering (DIS) data have been argued to exhibit tensions with
the data from charged-lepton DIS. Using the nCTEQ framework, we investigate
these possible tensions both internally and with the data sets used in our
recent nPDF analysis nCTEQ15WZSIH. We take into account nuclear effects in the
calculation of the deuteron structure function F_2^D using the CJ15 analysis.
The resulting nPDF fit, nCTEQ15WZSIHdeut, serves as the basis for our
comparison with inclusive neutrino DIS and charm dimuon production data. Using
χ^2 hypothesis testing, we confirm evidence of tensions with these data
and study the impact of the proton PDF baseline as well as the treatment of
data correlation and normalization uncertainties. We identify the experimental
data and kinematic regions that generate the tensions and present several
possible approaches how a consistent global analysis with neutrino data can be
performed. We show that the tension can be relieved using a kinematic cut at
low x (x>0.1) and also investigate a possibility of managing the tensions
by using uncorrelated systematic errors. Finally, we present a different
approach identifying a subset of neutrino data which leads to a consistent
global analysis without any additional cuts. Understanding these tensions
between the neutrino and charged-lepton DIS data is important not only for a
better flavor separation in global analyses of nuclear and proton PDFs, but
also for neutrino physics and for searches for physics beyond the Standard
Model.
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