Lattice QCD calculation of beyond the standard model kaon mixing at the physical point
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Date
23/12/2019Author
Kettle, Julia Rachael
Metadata
Abstract
This thesis presents beyond the standard (BSM) model kaon mixing results
calculated on the lattice with simulations at the physical light quark mass. These
results were calculated using RBC-UKQCD 2+1 flavour domain wall fermion
simulations at the iso-spin symmetric limit, with pion masses ranging from the
physical value up to 430 MeV. This thesis presents the bare results of BSM kaon
mixing bag parameters and ratios, alongside strange and light meson masses
and decay constants, it then details the renormalisation procedure and chiral
continuum extrapolation. Finally the renormalised continuum physical point
results of beyond the standard model bag parameters, ratio parameters and
matrix elements and the standard model bag parameter are presented. The
beyond the standard model kaon mixing matrix elements will improve upon
previous calculations' precision, and these results will help address previous
tensions seen in some of the BSM matrix elements. These quantities are important
in the search for new physics.