2020/08/31 by Huey-Wen Lin · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Isovector #Lattice QCD #Lattice field theory #Mathematical physics #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Renormalization #hep-lat #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevlett.127.182001
Typos fixed. Removed data using twisted-boundary conditions
arxiv created 2021/07/23 · openalex publication_date 2021/10/29 · arxiv updated 2021/11/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We present the first lattice calculation of the nucleon isovector unpolarized generalized parton distribution at the physical pion mass using a lattice ensemble with 2+1+1 flavors of highly improved staggered quarks generated by the MILC Collaboration, with lattice spacing a\ensuremath≈0.09 fm and volume 643\ifmmode×\else\texttimes\fi96. We use momentum-smeared sources to improve the signal at nucleon boost momentum Pz\ensuremath≈2.2 GeV and report results at nonzero momentum transfers in [0.2,1.0] GeV2. Nonperturbative renormalization in a regularization-independent momentum-subtraction scheme is used to obtain the quasidistribution before matching to the light-cone generalized parton distributions. The three-dimensional distributions H(x,Q2) and E(x,Q2) at \ensuremathξ=0 are presented, along with the three-dimensional nucleon tomography and impact parameter--dependent distribution for selected Bjorken x at \ensuremathμ=3 GeV in a modified minimal subtraction scheme.