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Computation of disconnected contributions to nucleon observables

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arxiv 1401.6749 v1 pith:TURIAO7P submitted 2014-01-27 hep-lat

Computation of disconnected contributions to nucleon observables

Constantia Alexandrou , Vincent Drach , Karl Jansen , Giannis Koutsou , Alejandro Vaquero This is my paper
classification hep-lat
keywords disconnectedmassnucleonoperatorscarriedclasscodecompare
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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