Speakers
Description
Precision flavour observables, such as CP violation in meson mixing, place stringent constraints on physics beyond the Standard Model. Matching the experimental accuracy of these observables requires equally precise theoretical inputs, combining high-order perturbative calculations with non-perturbative results from Lattice QCD. In this talk, I will present the two-loop matching calculations necessary for the NNLO RI/(S)MOM renormalisation of BK, the bag parameter relevant for εK. These results enable a consistent comparison of different determinations of BK, including both lattice and non-lattice approaches. I will discuss the resulting phenomenological implications and, in the outlook, highlight the role of other RI/(S)MOM matching calculations for Kaon physics.