Andre Walker-Loud
College of William & Mary
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Featured researches published by Andre Walker-Loud.
Physical Review D | 2013
Parikshit Junnarkar; Andre Walker-Loud
The scalar strange-quark matrix element of the nucleon is computed with lattice QCD. A mixed-action scheme is used with domain-wall valence fermions computed on the staggered MILC sea-quark configurations. The matrix element is determined by making use of the Feynman-Hellmann theorem which relates this strange matrix element to the change in the nucleon mass with respect to the strange-quark mass. The final result of this calculation is m_s = 49 +-10 +- 15 MeV and, correspondingly f_s = m_s / m_N = 0.051 +- 0.011 +- 0.016. Given the lack of a quantitative comparison of this phenomenologically important quantity determined from various lattice QCD calculations, we take the opportunity to present such an average. The resulting conservative determination is f_s = 0.043 +- 0.011.
Physical Review D | 2008
Silas R. Beane; Thomas Luu; Kostas Orginos; Assumpta Parreno; Martin J. Savage; Aaron Torok; Andre Walker-Loud
The
Physics Letters B | 2008
Paulo F. Bedaque; Michael I. Buchoff; Brian C. Tiburzi; Andre Walker-Loud
I=2
Nuclear Physics | 2005
B. C. Tiburzi; Andre Walker-Loud
Physical Review Letters | 2012
Andre Walker-Loud; Carl E. Carlson; Gerald A. Miller
\ensuremath{\pi}\ensuremath{\pi}
Physics Letters B | 2017
Evan Berkowitz; Thorsten Kurth; Amy N. Nicholson; Balint Joo; Enrico Rinaldi; Mark Strother; Pavlos Vranas; Andre Walker-Loud
scattering length is calculated in fully dynamical lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations (with fourth-rooted staggered sea quarks) at four light-quark masses. Two- and three-flavor mixed-action chiral perturbation theory at next-to-leading order is used to perform the chiral and continuum extrapolations. At the physical charged pion mass, we find
Physical Review D | 2010
William Detmold; Brian C. Tiburzi; Andre Walker-Loud
{m}_{\ensuremath{\pi}}{a}_{\ensuremath{\pi}\ensuremath{\pi}}^{I=2}=\ensuremath{-}0.043\text{ }30\ifmmode\pm\else\textpm\fi{}0.000\text{ }42
Physical Review D | 2009
William Detmold; Brian C. Tiburzi; Andre Walker-Loud
, where the error bar combines the statistical and systematic uncertainties in quadrature.
Physical Review D | 2008
William Detmold; Kostas Orginos; Martin J. Savage; Andre Walker-Loud
Novel chirally symmetric fermion actions containing the minimum amount of fermion doubling have been recently proposed in the literature. We study the symmetries and renormalization of these actions and find that in each case, discrete symmetries, such as parity and time-reversal, are explicitly broken. Consequently, when the gauge interactions are included, these theories radiatively generate relevant and marginal operators. The restoration of these symmetries and the approach to the continuum limit thus require the fine-tuning of several parameters. With some assumptions, we show that this behavior is expected for actions displaying minimal fermion doubling.
Physical Review D | 2008
Paulo F. Bedaque; Michael I. Buchoff; Brian C. Tiburzi; Andre Walker-Loud
The masses of the spin-3/2 baryons are calculated to next-to-next-to-leading order in heavy baryon chiral perturbation theory and partially quenched heavy baryon chiral perturbation theory. The calculation is performed for three light flavors in the isospin limit. These results are necessary for extrapolating QCD and partially quenched QCD lattice calculations of the decuplet baryon masses.