Tomasz Korzec

Axial nucleon form factors from lattice QCD

We present results on the nucleon axial form factors within lattice QCD using two flavors of degenerate twisted mass fermions. Volume effects are examined using simulations at two volumes of spatial length L=2.1 fm and L=2.8 fm. Cut-off effects are investigated using three different values of the lattice spacings, namely a=0.089 fm, a=0.070 fm and a=0.056 fm. The nucleon axial charge is obtained in the continuum limit and chirally extrapolated to the physical pion mass enabling comparison with experiment.

Nucleon electromagnetic form factors in twisted mass lattice QCD

Results on the electromagnetic form factors of the nucleon using twisted mass fermion configurations are presented. These include a gauge field ensemble simulated with two degenerate light quarks yielding a pion mass of around 130 MeV, as well as two ensembles that include strange and charm quarks in the sea yielding pion masses of 210 MeV and 373 MeV. Details of the methods used and systematic errors are discussed, such as noise reduction techniques and the effect of excited states contamination.

Moments of nucleon generalized parton distributions from lattice QCD

We present results on the lower moments of the nucleon generalized parton distri butions within lattice QCD using two dynamical flavors of degenerate twisted mass fermions. Our simulations are performed on lattices with three different values of the lattice spacings, namely

The accuracy of QCD perturbation theory at high energies

a=0.089

Electromagnetic form factors of the Ω − in lattice QCD

fm,

QCD Coupling from a Nonperturbative Determination of the Three-Flavor Λ Parameter

a=0.070

Nucleon form factors with dynamical twisted mass fermions

fm and

Setting the scale for the CLS

a=0.056

2 + 1

fm, allowing the investigation of cut-off effects. The volume dependence is examined using simulations on two lattices of spatial length

flavor ensembles

L=2.1