Theoretical challenges for flavor physics

Abstract

We discuss some highlights of the FCC-$$ee$$ ee flavor physics program. It will help to explore various aspects of flavor physics: to test precision calculations, to probe nonperturbative QCD methods, and to increase the sensitivity to physics beyond the standard model. In some areas, FCC-$$ee$$ ee will do much better than current and near-future experiments. We briefly discuss several probes that can be relevant for maximizing the gain from the FCC-$$ee$$ ee flavor program.

New physics in $B$ meson mixing: future sensitivity and limitations

“…• and a more speculative Phase III, which consists of Phase II together with a promising candidate for the next generation of colliders, namely, the Future Circular Collider (FCC) [11], more specifically its electron-positron phase. FCC-𝑒𝑒 can contribute substantially to flavour physics due to the large number of 𝑍 and 𝑊-pairs produced, which decay into all possible heavy flavours, in a clean experimental environment [12,13].…”

Theoretical challenges for flavor physics

“…The point is that different observables arise at different orders of SU (3) breaking, and while we cannot calculate how large this breaking is in specific matrix elements, it is typically of order 20%. Thus, by exploiting relations that hold to higher order in SU (3) breaking, we can derive a pattern that can be used to probe the SM [33,34].…”