Speaker
Mr
Maxwell Hansen
(University of Washington)
Description
We calculate matrix elements for beyond-the-Standard-Model contributions to neutral kaon mixing from mixed-action lattice simulations with staggered sea quarks and domain-wall valence quarks. We analyze the (2+1)-flavor MILC asqtad ensembles with multiple light sea-quark masses corresponding to staggered pions as light as 220 MeV on three different lattice spacings a ~ 0.12, 0.09, and 0.06 fm, and extrapolate our data to the physical light-quark masses and continuum using mixed-action chiral perturbation theory. We renormalize the matrix elements using mean-field improved lattice perturbation theory at one loop to obtain continuum values in the MS-bar scheme. Once our analysis is finalized, our results will help to improve constraints on new physics from experimental measurements of neutral kaon mixing.
Primary author
Mr
Maxwell Hansen
(University of Washington)
Co-authors
Jack Laiho
(Syracuse University)
Ruth Van de Water
(BNL)
