Flavour anomalies and new physics

by Prof. Ulrich Nierste (Institute for Theoretical Particle Physics (TTP), KIT)

Monday 27 May 2024, 14:15 → 16:15 Europe/Berlin

Precision studies of flavour-changing hadron decays are sensitive to beyond-Standard Model (BSM) interactions of quarks. Deviations between data and SM predictions, so-called flavour anomalies, may point to the energy scale at which future hadron colliders will discover new particles. I summarise the current status of these anomalies, with focus on observables measured in b-> s l+ l- and b-> c tau nu decays and their interpretation in terms of leptoquarks (LQ) with masses between a few and a few tens of TeV. Meaningful UV completions of such scenarios are theories with quark-lepton unification at a much higher scale and a large mass gap permits the study of LQ properties with the renormalisation group (RG). I present interesting infrared fixed-points of LQ couplings and show that lepton-flavour universality can emerge dynamically from the RG flow. Subsequently I discuss radiative corrections linking couplings probed in the low-energy  flavour experiments with those entering collider searches.