Speaker
Dr
Julien Frison
(University of Edinburgh)
Description
While Non-Perturbative Renormalisation by itself can be done at any scale, converting it to a perturbative scheme introduces a systematic error decreasing with the scale. In the case of the B_K four quark operator, this is now the dominant error on the MSbar result at 3 GeV. Increasing this scale requires both the access to finer lattices and a correct treatment of the charm effects. We will present a strategy based on step-scaling with a new set of Nf=2+1+1 ensembles generated by the RBC/UKQCD collaboration. In those preliminary results, we will use two different RI/SMOM schemes to estimate the matching error, and we will show that our data gives us good control on chiral and continuum limits.
Primary author
Dr
Julien Frison
(University of Edinburgh)
