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Ron Morgan

Publications and source records attributed to Ron Morgan.

2 recordsLinked to original sources
arXiv2014

Polynomial Subtraction Method for Disconnected Quark Loops

The polynomial subtraction method, a new numerical approach for reducing the noise variance of Lattice QCD disconnected matrix elements calculation, is introduced in this paper. We use the MinRes polynomial expansion of the QCD matrix as the approximation to the matrix inverse and get a significant reduction in the variance calculation. We compare our results with that of the perturbative subtraction and find that the new strategy yields a faster decrease in variance which increases with quark mass.

hep-lat↗
arXiv2005

Disconnected Loops with Twisted Mass Lattice QCD

We give a general introduction and discussion of the issues involved in using the twisted mass formulation of lattice fermions in the context of disconnected loop calculations, including a short orientation on the present experimental situation for nucleon strange quark form factors. A prototype calculation of the disconnected part of the nucleon scalar form factor is described.

hep-lat↗