Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proton-PDF uncertainties in extracting nuclear PDFs from $W^\pm$
  production in p+Pb collisions   We discuss the recent CMS Collaboration measurement of $W^\pm$ boson
production in p+Pb collisions at 8.16 TeV in terms of the constraining power on
nuclear parton distribution functions (PDFs). The impact of the free-proton PDF
uncertainties on the nuclear PDF extraction is quantified by using a
theoretical covariance-matrix method and Hessian PDF reweighting. We discuss
different ways to mitigate these theoretical uncertainties, including
self-normalization, forward-to-backward ratios and nuclear-modification ratios.
It is found that none of these methods offer perfect cancellation of the
free-proton PDFs but, with the present data uncertainties, the residual
free-proton-PDF dependence has, conveniently for the global analyses, little
effect on the extraction of the nuclear modifications. Based on a simple
estimate of obtainable statistics at the LHC Run 3, we argue that this will
change in the near future and it becomes more important to propagate the
proton-PDF uncertainties accordingly. Using the obtained information on the
correlations of the free-proton uncertainties, we also identify a new charge
asymmetry ratio, where the cancellation of the proton-PDF uncertainties is
found to be extremely good.

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The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol