Using stochastic estimators for connected meson and baryon three-point functions has successfully been tried in the past years. Compared to the standard sequential source method we trade the freedom to compute the current-to-sink propagator independently of the hadron sink for additional stochastic noise in our observables. In the case of the nucleon we can use this freedom to compute many different sink-momentum/polarization combinations, which grants access to more virtualities. We will present preliminary results on the scalar, electro-magnetic and axial form factors of the nucleon in Nf=2+1 lattice QCD and contrast the performance of the stochastic method to the sequential source method. We find the stochastic method to be competitive in terms of errors at fixed cost.
@article{arxiv.1311.1718,
title = {Nucleon structure from stochastic estimators},
author = {Gunnar S. Bali and Sara Collins and Benjamin Gläßle and Meinulf Göckeler and Johannes Najjar and Rudolf Rödl and Andreas Schäfer and André Sternbeck and Wolfgang Söldner},
journal= {arXiv preprint arXiv:1311.1718},
year = {2013}
}
Comments
presented at the 31st International Symposium on Lattice Field Theory (Lattice 2013), 29 July - 3 August 2013, Mainz, Germany