Lattice2010

Session

Parallel 25: Hadronic structure and interactions

15 Jun 2010, 14:30

Villasimius, Sardinia

154. Light meson form factors in $N_f=2+1$ QCD with dynamical overlap quarks

Takashi Kaneko (KEK)

15/06/2010, 14:30

Hadronic structure and interactions

We report on our study of pion and kaon form factors in three-flavor QCD with dynamical overlap quarks. Connected and disconnected meson three-point functions are calculated using the all-to-all propagator on a $16^3 \times 48$ lattice at a lattice spacing of 0.11 fm. We present preliminary results for the electromagnetic, scalar and weak decay form factors.

161. Wilson fermions at fine lattice spacings: scale setting, pion form factors and (g-2)

Hartmut Wittig (University of Mainz)

15/06/2010, 14:50

Hadronic structure and interactions

We present an update on our on-going project to compute hadronic observables for Nf=2 flacours of O(a) improved Wilson fermions at small lattice spacings. The procedure to determine the lattice scale via the mass of the Omega baryon is described. Furthermore we present preliminary results for the pion form factor computed using twisted boundary conditions, as well as for the contribution...

100. Nucleon magnetic moments and electric polarizabilities

Brian Tiburzi (University of Maryland)

15/06/2010, 15:10

Hadronic structure and interactions

Electromagnetic properties of the nucleon are explored with lattice QCD using a novel technique. Focusing on background electric fields, we show how the electric polarizability can be extracted from nucleon correlation functions. A crucial step concerns addressing contributions from the magnetic moment, which affects the relativistic propagation of nucleons in electric fields. By properly...

330. Hadron electric polarizability -- finite volume corrections

Andrei Alexandru (The George Washington University)

15/06/2010, 15:30

Hadronic structure and interactions

Hadron polarizability are usually measured on the lattice using the background field method. To create a uniform field one can use either periodic boundary conditions that force the electromagnetic field to assume quantized values or Dirichlet boundary conditions where the field can assume any value but the translational invariance is broken. In both cases, the energy shifts measured have...

304. Magnetic Moments of Negative-Parity Baryons from Lattice QCD

Frank Lee (George Washington University)

15/06/2010, 15:50

Hadronic structure and interactions

We compute the magnetic moments of negative-parity baryons in the background field method. They are extracted from small mass shifts caused by external magnetic fields introduced on the lattice. The calculations are done on quenched configurations using standard Wilson actions, with pion masses down to about 500 MeV, several field strengths, and high statistics. For comparison purposes, we...