Lattice2010

Session

Parallel 01: Hadronic structure and interactions

14 Jun 2010, 14:30

Villasimius, Sardinia

144. Nucleon form factors and structure functions from Nf=2 clover fermions

Dirk Pleiter (DESY)

14/06/2010, 14:30

Hadronic structure and interactions

We present an update on the ongoing efforts of the QCDSF collaboration to compute the nucleon's generalized) form factors and moments of structure functions. The focus will be on our most recent results obtained on gauge configurations where the pseudo-scalar meson mass is in the range of 170-270 MeV. We will compare our results with calculations carried out in chiral effective theories.

112. Systematic errors in extracting nucleon properties from lattice QCD

Bastian Knippschild (university of mainz)

14/06/2010, 14:50

Hadronic structure and interactions

Form factors of the nucleon have been extracted from experiment with high precision. However, lattice calculations have failed so far to reproduce the observed dependence of form factors on the momentum transfer. We have embarked on a program to thoroughly investigate systematic effects in lattice calculation of the required three-point correlation functions. In this talk we focus on the...

318. Hadron Form Factors at Large Transfer Momentum (I)

Saul Cohen (Boston University)

14/06/2010, 15:10

Hadronic structure and interactions

We report a recent breakthrough in lattice QCD calculations of hadron form factors at large momentum transfer. Conventional lattice form-factor calculations typically reach about 2.5 GeV$^2$ or less, but in this work the transfer momentum is pushed as high as 6 GeV$^2$. Our approach can be applied to isotropic lattices and lattices with smaller lattice spacing to calculate even...

313. Axial and pseudoscalar form-factors of the Delta baryon

Eric Gregory (University of Cyprus)

14/06/2010, 15:30

Hadronic structure and interactions

We discuss results on the axial and pseudoscalar Delta form factors. We first test the lattice set-up in the quenched approximation and present first results with a hybrid action using a staggered sea and domain-wall valence fermions.

120. Hyperon Form Factors from N_f=2+1 QCD

James Zanotti (University of Edinburgh)

14/06/2010, 15:50

Hadronic structure and interactions

We present results from the QCDSF collaboration for the electromagnetic and semi-leptonic form factors for the hyperons. The simulations are performed on our new ensembles generated with 2+1 flavours of dynamical O(a)-improved Wilson fermions. A unique feature of these configurations is that the quark masses are tuned so that the singlet quark mass is held fixed at its physical value. We...