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Description
The origin of the suppressed flavor transitions across quark generations remains one of the longstanding puzzles of the Standard Model, manifested experimentally in the near-diagonal structure of the CKM matrix and in the decay rates of various B mesons. In this talk, I will explore this question within the framework of asymptotically safe quantum gravity coupled to matter. In particular, I investigate a scenario in which quantum scale symmetry not only provides a UV completion for the gauge–Yukawa sector of the Standard Model, but also leaves observable imprints on the flavor pattern encoded in the CKM matrix. I will show how the near-diagonal form of the CKM matrix can emerge dynamically through renormalization-group flows toward fixed lines in the CKM sector. Finally, I examine the universality of this mechanism by studying how large regions of the ultraviolet parameter space flow toward phenomenologically viable low-energy physics consistent with observation.