Computation of disconnected contributions to nucleon observables

Constantia Alexandrou; Vincent Drach; Karl Jansen; Giannis Koutsou; Alejandro Vaquero

Computation of disconnected contributions to nucleon observables

High Energy Physics - Lattice 2014-01-28 v1

Authors: Constantia Alexandrou , Vincent Drach , Karl Jansen , Giannis Koutsou , Alejandro Vaquero

Abstract

We compare several methods for computing disconnected fermion loops contributing to nucleon three-point functions. The comparison is carried out using one ensemble of $N_f=2+1+1$ twisted mass fermions with pion mass of 373 MeV. The complete set of operators up to one-derivative are examined by developing optimized code for mutli-GPUs. Simple guidelines are given as to the preferable method for each class of operators.

Keywords

disconnected fermion loops nucleon three-point functions twisted mass fermions multi-GPU optimization lattice QCD

Cite

@article{arxiv.1401.6749,
  title  = {Computation of disconnected contributions to nucleon observables},
  author = {Constantia Alexandrou and Vincent Drach and Karl Jansen and Giannis Koutsou and Alejandro Vaquero},
  journal= {arXiv preprint arXiv:1401.6749},
  year   = {2014}
}

Comments

7 pages, 4 figures. Proceedings of the talk given during the $31^{st}$ International Symposium on Lattice Field Theory, July 29 - August 3, 2013, Mainz, Germany

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