Proton's Isovector Parton Distribution Function with Updated Analysis of Large-Momentum Lattice Data
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Published on: July 19, 2019
1Shanghai Jiao Tong University, Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai 201210, China.
Abstract:
The proton's unpolarized u(x)-d(x) parton distribution function (PDF) has been studied by a number of lattice QCD groups through large momentum expansion. However, due to lattice artifacts (excited state contaminations, unphysical pion masses, and discretization effects) and less-advanced theoretical analysis (renormalizations, large-distance extrapolations, and large-log resummations), the resulting PDFs cannot be compared strictly with experimental data. By using the state-of-the-art theoretical tools and mitigating the lattice artifacts empirically, we reanalyze the available datasets in the literature and find that the new PDF for the physical-limit-extrapolated dataset (MSULat20) is consistent with global fits within ∼1σ, while others are broadly compatible. This provides evidence that large momentum expansion is capable of accurately predicting the x dependence of the PDFs when ideal lattice data become available.
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