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29 papers · 1 filter
Exploring the meson spectrum with twisted mass lattice QCD
Robert G. Petry, Derek Harnett, Randy Lewis +1
Numerical simulations with access to all possible meson quantum numbers, J^{PC}, are presented using two-flavor (up and down) quenched twisted mass lattice QCD with three different…
Vacuum Expectation Values of Twisted Mass Fermion Operators
Abdou Abdel-Rehim, Randy Lewis, Walter Wilcox
Using noise methods on a quenched lattice at , we have investigated vacuum expectation values and relative linear correlations among the various Wilson and…
Evolutionary Fitting Methods for the Extraction of Mass Spectra in Lattice Field Theory
Georg M. von Hippel, Randy Lewis, Robert G. Petry
We present an application of evolutionary algorithms to the curve-fitting problems commonly encountered when trying to extract particle masses from correlators in Lattice QCD. Harn…
Unquenching effects on the coefficients of the Lüscher-Weisz action
Zh. Hao, G. M. von Hippel, R. R. Horgan +2
The effects of unquenching on the perturbative improvement coefficients in the Symanzik action are computed within the framework of Lüscher-Weisz on-shell improvement. We find that…
Lattice QCD with a twisted mass term and a strange quark
Abdou M. Abdel-Rehim, Randy Lewis, R. M. Woloshyn +1
There are three quarks with masses at or below the characteristic scale of QCD dynamics: up, down and strange. However, twisted mass lattice QCD relies on quark doublets. Various o…
Chiral corrections to the Roper mass
B. Borasoy, P. C. Bruns, U. -G. Meißner +1
We analyze the quark mass dependence of the Roper mass to one-loop order in relativistic baryon chiral perturbation theory. The loop integrals are evaluated using infrared regulari…