Systematic uncertainties in parton distribution functions from lattice QCD simulations at the physical point
arXiv:1902.00587 · doi:10.1103/PhysRevD.99.114504
Abstract
We present a detailed study of the helicity-dependent and helicity-independent collinear parton distribution functions (PDFs) of the nucleon, using the quasi-PDF approach. The lattice QCD computation is performed employing twisted mass fermions with a physical value of the light quark mass. We give a systematic and in-depth account of the salient features entering in the evaluation of quasi-PDFs and their relation to the light-cone PDFs. In particular, we give details for the computation of the matrix elements, including the study of the various sources of systematic uncertainties, such as excited states contamination. In addition, we discuss the non-perturbative renormalization scheme used here and its systematics, effects of truncating the Fourier transform and different matching prescriptions.
47 pages, 33 figures, 6 tables
References in corpus (18)
- Extraction of Spin-Dependent Parton Densities and Their Uncertainties
- A first unbiased global determination of polarized PDFs and their uncertainties
- Exploring hadrons' partonic structure using ab initio lattice QCD calculations
- Exclusive processes in position space and the pion distribution amplitude
- A Lattice Calculation of Parton Distributions
- A complete non-perturbative renormalization prescription for quasi-PDFs
- On the Renormalizability of Quasi Parton Distribution Functions
- Pion Valence Quark Distribution from Matrix Element Calculated in Lattice QCD
- Parton Distribution Function with Non-perturbative Renormalization from Lattice QCD
- Nonperturbative Evolution of Parton Quasi-Distributions
- More On Large-Momentum Effective Theory Approach to Parton Physics
- Reconstructing parton distribution functions from Ioffe time data: from Bayesian methods to Neural Networks
- Adaptive Aggregation-based Domain Decomposition Multigrid for Twisted Mass Fermions
- Nonperturbative partonic quasidistributions of the pion from chiral quark models
- Renormalization of local quark-bilinear operators for Nf=3 flavors of SLiNC fermions
- Quasi-parton distribution functions: a study in the diquark spectator model
- The Quark and Gluon Structure of the Proton
- Reconstructing parton densities at large fractional momenta