Speaker
Description
Recent reduced pseudo Ioffe time distributions and matrix elements of current-current correlators generated from lattice QCD are used simultaneously with experimental data to extract pion parton distribution functions (PDFs) from a Monte Carlo global QCD analysis. Through the complementarity of the experimental and lattice QCD data, the analysis rigorously quantifies both the uncertainties of the pion PDFs and systematic effects intrinsic to the lattice QCD observables.
The reduced pseudo Ioffe time distributions significantly decrease the uncertainties on the PDFs, while the current-current correlators are limited by the systematic effects associated with the lattice. Consistent with recent phenomenological determinations, the behavior of the valence quark
distribution of the pion at large momentum fraction is found to be $\sim(1−x)^{\beta_{\rm eff}}$ with $\beta_{\rm eff} \sim 1.0−1.2$.
Submitted on behalf of a Collaboration? | No |
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