20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Nucleon form factors and moments of nucleon generalized parton distributions in twisted mass lattice QCD

22 Jul 2011, 11:15
15m
Bayard (Alpes Congrès - Alpexpo)

Bayard

Alpes Congrès - Alpexpo

Parallel session talk QCD QCD

Speaker

Dr Martha Constantinou (University of Cyprus)

Description

We present results on the nucleon electromagnetic/axial form factors, as well as the lower moments of the nucleon generalized parton distributions, 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 a=0.089 fm, a=0.070 fm and a=0.056 fm, allowing the investigation of cut-off effects. The volume dependence is examined using simulations on two lattices of spatial length L=2.1 fm and L=2.8 fm. The simulations span pion masses in the range of 260-470 MeV. Our results are renormalized non-perturbatively and the values are given in the MS-scheme at a scale mu=2 GeV. The nucleon axial charge, magnetic moment, Dirac and Pauli radii are obtained in the continuum limit and chirally extrapolated to the physical pion mass allowing for a comparison with experiment. The consequences of our results on the spin carried by the quarks in the nucleon are also investigated.

Primary author

Dr Martha Constantinou (University of Cyprus)

Co-authors

Prof. Constantia Alexandrou (University of Cyprus) Prof. Jaume Carbonell (Laboratoire de Physique Subatomique et Cosmologie, UJF/CNRS/IN2P3) Prof. Karl Jansen (NIC, DESY) Dr Mariane Brinet (Laboratoire de Physique Subatomique et Cosmologie, UJF/CNRS/IN2P3) Dr Mauro Papinutto (Laboratoire de Physique Subatomique et Cosmologie, UJF/CNRS/IN2P3) Dr Pierre Antoine Harraud (Laboratoire de Physique Subatomique et Cosmologie, UJF/CNRS/IN2P3) Prof. Pierre Guichon (CEA-Saclay, IRFU/Service de Physique Nucl ́eaire) Dr Tomasz Korzec (Institut fur Physik Humboldt Universitat zu Berlin)

Presentation Materials