72 citations · 516 across the 56 of their papers we have counts for
44 papers · 1 filter
Magnetic polarizability of a charged pion from four-point functions in lattice QCD
Frank X. Lee, Walter Wilcox, Andrei Alexandru +1
Electromagnetic dipole polarizabilities are fundamental properties of a hadron that represent its resistance to deformation under external fields. For a charged hadron, the presenc…
Multi-Polynomial Monte Carlo for Trace Estimation in Lattice QCD
Paul Lashomb, Ronald B. Morgan, Travis Whyte +1
Estimating the trace of the inverse of a large matrix is an important problem in lattice quantum chromodynamics. A multilevel Monte Carlo method is proposed for this problem that u…
High-degree Polynomial Noise Subtraction
Paul Lashomb, Ronald B. Morgan, Travis Whyte +1
In lattice QCD, the calculation of physical quantities from disconnected quark loop calculations have large variance due to the use of Monte Carlo methods for the estimation of the…
Charged pion electric polarizability from four-point functions in lattice QCD
Frank X. Lee, Andrei Alexandru, Chris Culver +1
Polarizabilities reveal valuable information on the internal structure of hadrons in terms of charge and current distributions. For neutral hadrons, the standard approach is the ba…
Lattice QCD and Particle Physics
Andreas S. Kronfeld, Tanmoy Bhattacharya, Thomas Blum +79
Contribution from the USQCD Collaboration to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021).
Measuring charged particle polarizabilities on the lattice without background fields
Walter Wilcox, Frank X. Lee
We show how to compute electromagnetic polarizabilities of charged hadrons without the use of background fields in lattice QCD. The low-energy behavior of the Compton scattering am…
Towards charged hadron polarizabilities from four-point functions in lattice QCD
Walter Wilcox, Frank X. Lee
We show how to compute electromagnetic polarizabilities of charged hadrons using four-point functions in lattice QCD. The low-energy behavior of Compton scattering amplitude is mat…
Disconnected Loop Subtraction Methods in Lattice QCD
Travis Whyte, Suman Baral, Paul Lashomb +2
Noise subtraction methods are a set of techniques that aim to reduce the variance of signals in LQCD which are often flooded with noise. The standard approach is a pertubative subt…
Deflated GMRES with Multigrid for Lattice QCD
Travis Whyte, Walter Wilcox, Ronald B. Morgan
Lattice QCD solvers encounter critical slowing down for fine lattice spacings and small quark mass. Traditional matrix eigenvalue deflation is one approach to mitigating this probl…
Disconnected Loop Subtraction Methods in Lattice QCD
Suman Baral, Travis Whyte, Walter Wilcox +1
Lattice QCD calculations of disconnected quark loop operators are extremely computer time-consuming to evaluate. To compute these diagrams using lattice techniques, one generally u…
New Noise Subtraction Methods in Lattice QCD
Suman Baral, Walter Wilcox, Ronald B. Morgan
Noise subtraction techniques can help reduce the statistical uncertainty in the extraction of hard to detect signals. We describe new noise subtraction methods in Lattice QCD which…
Polynomial Subtraction Method for Disconnected Quark Loops
Quan Liu, Walter Wilcox, Ron Morgan
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…
Eigenspectrum Noise Subtraction Methods in Lattice QCD
Victor Guerrero, Ronald B. Morgan, Walter Wilcox
We propose a new noise subtraction method, which we call "eigenspectrum subtraction", which uses low eigenmode information to suppress statistical noise at low quark mass. This is…
Seed methods for linear equations in lattice qcd problems with multiple right-hand sides
Abdou Abdel-Rehim, Ronald B. Morgan, Walter Wilcox
We consider three improvements to seed methods for Hermitian linear systems with multiple right-hand sides: only the Krylov subspace for the first system is used for seeding subseq…
Tests of Electric Polarizability on the Lattice
Victor X. Guerrero, Walter Wilcox, Joe Christensen
Using clover fermions on CP-PACS dynamical configurations, we consider a number of ways of measuring hadronic electric polarizability, an effect in hadron masses…
Deflated Hermitian Lanczos Methods for Multiple Right-Hand Sides
Abdou M. Abdel-Rehim, Ronald B. Morgan, Dywayne Nicely +1
A deflated and restarted Lanczos algorithm to solve hermitian linear systems, and at the same time compute eigenvalues and eigenvectors for application to multiple right-hand sides…
Deflation Methods in Fermion Inverters
Walter Wilcox
I will review recent developments in matrix deflation methods, by Ronald Morgan/Walter Wilcox, Andreas Stathopoulos/Konstantinos Orginos, and Martin Lüscher, with application to la…
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…
Magnetic Moment of Vector Mesons in the Background Field Method
Frank X. Lee, Scott Moerschbacher, Walter Wilcox
We report some results for the magnetic moments of vector mesons extracted from mass shifts in the presence of static external magnetic fields. The calculations are done on …
Deflated BiCGStab for linear equations in QCD problems
Abdou Abdel-Rehim, Ronald B. Morgan, Walter Wilcox
The large systems of complex linear equations that are generated in QCD problems often have multiple right-hand sides (for multiple sources) and multiple shifts (for multiple masse…
Disconnected Loops with Twisted Mass Lattice QCD
Walter Wilcox, Dean Darnell, Ron Morgan +1
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, inc…
Magnetic polarizability of hadrons from lattice QCD in the background field method
F. X. Lee, L. Zhou, W. Wilcox +1
We present a calculation of hadron magnetic polarizability using the techniques of lattice QCD. This is carried out by introducing a uniform external magnetic field on the lattice…
Electric Polarizability of Neutral Hadrons from Lattice QCD
Joe Christensen, Walter Wilcox, Frank X. Lee +1
By simulating a uniform electric field on a lattice and measuring the change in the rest mass, we calculate the electric polarizability of neutral mesons and baryons using the meth…
Deflation of Eigenvalues for Iterative Methods in Lattice QCD
Dean Darnell, Ronald B. Morgan, Walter Wilcox
Work on generalizing the deflated, restarted GMRES algorithm, useful in lattice studies using stochastic noise methods, is reported. We first show how the multi-mass extension of d…