Calculation of fermion loops for $η^\prime$ and nucleon scalar and electromagnetic form factors

Details Calculation of fermion loops for $η^\prime$ and nucleon scalar and electromagnetic form factors Calculation of fermion loops for $η^\prime$ and nucleon scalar and electromagnetic form factors

2011-08-11

arxiv.org/abs/1108.2473v2

Physics

High Energy Physics

High Energy Physics - Lattice

Version accepted for publication in Comp. Phys. Commun. References added. 13 pages, 12 figures

Scientific paper

The exact evaluation of the disconnected diagram contributions to the flavor-singlet pseudoscalar meson mass, the nucleon sigma term and the nucleon electromagnetic form factors, is carried out utilizing GPGPU technology with the NVIDIA CUDA platform. The disconnected loops are also computed using stochastic methods with several noise reduction techniques. Various dilution schemes as well as the truncated solver method are studied. We make a comparison of these stochastic techniques to the exact results and show that the number of noise vectors depends on the operator insertion in the fermionic loop.

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