Giannis Koutsou

Light baryon masses with dynamical twisted mass fermions

We present results on the mass of the nucleon and the

Disconnected quark loop contributions to nucleon observables in lattice QCD

\ensuremath{\Delta}

Baryon spectrum with

using two dynamical degenerate twisted mass quarks and the tree-level Symanzik improved gauge action. The evaluation is performed at four quark masses corresponding to a pion mass in the range of about 300\char21{}600 MeV on lattices of 2.1\char21{}2.7 fm at three lattice spacings less than 0.1 fm. We check for cutoff effects by evaluating these baryon masses on lattices of spatial size 2.1 fm at

N_f = 2 + 1 + 1

\ensuremath{\beta}=3.9

twisted mass fermions

and

Nucleon form factors and moments of generalized parton distributions using

\ensuremath{\beta}=4.05

N_f=2+1+1

and on a lattice of 2.4 fm at

twisted mass fermions

\ensuremath{\beta}=3.8

Direct Evaluation of the Quark Content of Nucleons from Lattice QCD at the Physical Point.

. The values we find are compatible within our statistical errors. Lattice results are extrapolated to the physical limit using continuum chiral perturbation theory. Performing a combined fit to our lattice data at

Nucleon electromagnetic form factors from lattice QCD

\ensuremath{\beta}=3.9