Nucleon Generalized Parton Distributions from Full Lattice QCD
Ph. H\"agler, W. Schroers, J. Bratt, R.G. Edwards, M. Engelhardt, G.T., Fleming, B. Musch, J.W. Negele, K. Orginos, A.V. Pochinsky, D.B. Renner, D.G., Richards (LHPC Collaboration)
TL;DR
This paper computes the lowest moments of nucleon generalized parton distributions using lattice QCD with domain wall and staggered quarks, providing insights into nucleon structure at near-physical pion masses.
Contribution
It offers a comprehensive lattice QCD calculation of nucleon GPD moments with improved renormalization and larger volumes, including both helicity dependent and independent distributions.
Findings
Calculated GPD moments at pion masses as low as 350 MeV
Used non-perturbative renormalization for improved accuracy
Included large lattice volumes for better finite-size control
Abstract
We present a comprehensive study of the lowest moments of nucleon generalized parton distributions in N_f=2+1 lattice QCD using domain wall valence quarks and improved staggered sea quarks. Our investigation includes helicity dependent and independent generalized parton distributions for pion masses as low as 350 MeV and volumes as large as (3.5 fm)^3, for a lattice spacing of 0.124 fm. We use perturbative renormalization at one-loop level with an improvement based on the non-perturbative renormalization factor for the axial vector current, and only connected diagrams are included in the isosinglet channel.
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