Strange nucleon electromagnetic form factors from lattice QCD

Abstract

We evaluate the strange nucleon electromagnetic form factors using an ensemble of gauge configurations generated with two degenerate maximally twisted mass clover-improved fermions with mass tuned to approximately reproduce the physical pion mass. In addition, we present results for the disconnected light quark contributions to the nucleon electromagnetic form factors. Improved stochastic methods are employed leading to high-precision results. The momentum dependence of the disconnected contributions is fitted using the model-independent z-expansion. We extract the magnetic moment and the electric and magnetic radii of the proton and neutron by including both connected and disconnected contributions. We find that the disconnected light quark contributions to both electric and magnetic form factors are non-zero and at the few percent level as compared to the connected. The strange form factors are also at the percent level but more noisy yielding statistical errors that are typically within one standard deviation from a zero value.

10 pages, 11 figures

References in corpus (10)

• Nucleon Electromagnetic Form Factors
• Model independent extraction of the proton charge radius from electron scattering
• Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q**2=0.22 (GeV/c)**2
• Nucleon axial form factors using lattice QCD simulations with a physical value of the pion mass
• Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass
• The nucleon electromagnetic form factors from Lattice QCD
• Model independent extraction of the proton magnetic radius from electron scattering
• Low-lying baryon masses using $N_f=2$ twisted mass clover-improved fermions directly at the physical point
• Nucleon electromagnetic form factors using lattice simulations at the physical point
• Sea Quarks Contribution to the Nucleon Magnetic Moment and Charge Radius at the Physical Point

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• Nucleon strange electromagnetic form factors
• Strange electromagnetic form factors of the nucleon with $N_f=2+1$ $\mathcal{O}(a)$-improved Wilson fermions
• Neutral Current Neutrino-Nucleus Scattering. Theory
• The SU(3) Vector Currents in BChPT x 1/Nc
• Sea quark contributions to nucleon electromagnetic form factors with the nonlocal chiral effective Lagrangian
• Sea quark contributions to the electromagnetic form factors of $\Sigma$ hyperons
• Chiral, parity-doublet, effective-Lagrangian mean-field theories for nuclear and astrophysical phenomenology