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We present a lattice-QCD calculation of the unpolarized isovector partondistribution function (PDF) using ensembles at the physical pion mass withlarge proton boost momenta $P_z \in \{2.2,2.6,3.0\}$~GeV within the frameworkof large-momentum effective theory (LaMET). In contrast to our previousphysical-pion PDF result, we increase the statistics significantly, double theboost momentum, increase the investment in excited-state contaminationsystematics, and switch to $\gamma_t$ operator to avoid mixing with scalarmatrix elements. We use four source-sink separations in our analysis to controlthe systematics associated with excited-state contamination. The one-loop LaMETmatching corresponding to the new operator is calculated and applied to ourlattice data. We detail the systematics that affect PDF calculations, providingguidelines to improve the precision of future lattice PDF calculations. We findour final parton distribution to be in reasonable agreement with the PDFprovided by the latest phenomenological analysis.

Lattice Calculation of Parton Distribution Function from LaMET at Physical Pion Mass with Large Nucleon Momentum