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8 papers · 2 filters
Finite volume renormalization scheme for fermionic operators
Christopher Monahan, Kostas Orginos
We propose a new finite volume renormalization scheme. Our scheme is based on the Gradient Flow applied to both fermion and gauge fields and, much like the Schrödinger functional m…
Automated lattice perturbation theory
Christopher Monahan
I review recent developments in automated lattice perturbation theory. Starting with an overview of lattice perturbation theory, I focus on the three automation packages currently…
B, Bs, K and pi weak matrix elements with physical light quarks
R. J. Dowdall, C. T. H. Davies, R. R. Horgan +4
Calculations of pseudoscalar decay constants of B, Bs, K and pi mesons with physical light quarks are presented. We use HISQ ensembles that include u,d,s and c sea quarks at three…
Rare decay B -> K ll form factors from lattice QCD
Chris Bouchard, G. Peter Lepage, Christopher Monahan +2
We calculate, for the first time using unquenched lattice QCD, form factors for the rare decay B -> Kll in and beyond the Standard Model. Our lattice QCD calculation utilizes a non…
The mass of the b-quark from lattice NRQCD and lattice perturbation theory
A. J. Lee, C. J. Monahan, R. R. Horgan +3
We present a determination of the b-quark mass accurate through O(α_s^2) in perturbation theory and including partial contributions at O(α_s^3). Nonperturbative input comes from th…
Extending the eigCG algorithm to nonsymmetric Lanczos for linear systems with multiple right-hand sides
A. M. Abdel-Rehim, Andreas Stathopoulos, Kostas Orginos
The technique that was used to build the EigCG algorithm for sparse symmetric linear systems is extended to the nonsymmetric case using the BiCG algorithm. We show that, similarly…