Systematic errors in extracting nucleon properties from lattice QCD

Abstract

Form factors of the nucleon have been extracted from experiment with high precision. However, lattice calculations have failed so far to reproduce the observed dependence of form factors on the momentum transfer. We have embarked on a program to thoroughly investigate systematic effects in lattice calculation of the required three-point correlation functions. Here we focus on the possible contamination from higher excited states and present a method which is designed to suppress them. Its effectiveness is tested for several baryonic matrix elements, different lattice sizes and pion masses.

7 pages, 8 figures

References in corpus (5)

• Flavor Symmetry and the Static Potential with Hypercubic Blocking
• Nucleon form factors with 2+1 flavor dynamical domain-wall fermions
• Wilson fermions at fine lattice spacings: scale setting, pion form factors and (g-2)_mu
• Mesonic and baryonic correlation functions at fine lattice spacings
• Nucleon form factors with dynamical twisted mass fermions

Cited by in corpus (7)

• Nucleon isovector charges and twist-2 matrix elements with $N_f=2+1$ dynamical Wilson quarks
• On the computation of hadron-to-hadron transition matrix elements in lattice QCD
• A Stochastic Method for Computing Hadronic Matrix Elements
• Hadron Structure and Form Factors
• The Shape of Covariantly Smeared Sources in Lattice QCD
• Low-energy particle physics and chiral extrapolations
• Nucleon Structure in Lattice QCD using twisted mass fermions