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Published on: May 1, 2018
Gradient Flow for Parton Distribution Functions: First Application to the Pion
Anthony Francis1, Patrick Fritzsch2, Robert V Harlander3
1National Yang Ming Chiao Tung University, Institute of Physics, 30010 Hsinchu, Taiwan.
None:
Parton distribution functions (PDFs) are central to precision QCD phenomenology. Their Mellin moments can be computed on the lattice, but direct determinations using local operators, besides ⟨x⟩, face severe challenges from reduced hypercubic symmetry, limiting results to the lowest moments. A recently proposed method resolves these issues using gradient flow. We demonstrate the efficacy of this method by computing ratios of flavor nonsinglet pion PDF moments up to ⟨x^{5}⟩ on four lattice spacings at m_{π}≃411 MeV. The moments and reconstructed PDF agree quantitatively with recent phenomenological extractions.
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