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SUMMARY:A symmetry-based top-down approach to the Standard Model flavor pu
 zzle - Andreas Trautner (Heidelberg)
DTSTART:20230517T130000Z
DTEND:20230517T140000Z
UID:TALK201223@talks.cam.ac.uk
CONTACT:Jim Talbert
DESCRIPTION:With decades worth of data from high precision experiments and
  robust confirmation at the LHC\, addressing the Standard Model flavor puz
 zle is more pressing than ever. I will pedagogically introduce the flavor 
 puzzle\, then demonstrate how understanding the origin of charge-parity (C
 P) violation offers a new starting point to address it. Group theoreticall
 y\, the physical CP transformation of the Standard Model is a special oute
 r automorphism ("symmetry of a symmetry") of the theory and I will explain
  what that means in simple terms. Having this understood\, it follows that
  certain classes of symmetries preclude the existence of CP transformation
 s altogether\, in which case matter-antimatter symmetry is violated by cal
 culable ("geometrical") phases. Interestingly\, this mechanism of predicti
 ve CP violation is naturally present in UV completions of the Standard Mod
 el offered by String Theory. In such a UV complete approach to flavor\, th
 e existence of flavor symmetries beyond the Standard Model is imperative a
 nd understanding their outer automorphisms uncovers an auspicious unificat
 ion of "traditional" flavor symmetries\, modular symmetries\, discrete R s
 ymmetries of supersymmetry\, as well as CP symmetry - altogether dubbed th
 e eclectic flavor symmetry. I will show a first explicit example model der
 ived along these lines which can successfully accommodate the available ex
 perimental data\, while giving rise to testable predictions for so-far und
 etermined parameters.
LOCATION:Both in-person (MR9\, DAMTP) and online (details to be sent by em
 ail)
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