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SUMMARY:Closing in on New Physics with the Flavor\, Collider\, and Electro
 weak Triad - Benjamin Stefanek (King's Coll. London)
DTSTART:20240209T160000Z
DTEND:20240209T170000Z
UID:TALK210052@talks.cam.ac.uk
CONTACT:Nico Gubernari
DESCRIPTION:Any new physics (NP) lying at the TeV scale must pass stringen
 t flavor as well as collider bounds.\nSince the top Yukawa gives the large
 st quantum correction to the Higgs mass\, one well-motivated expectation i
 s TeV-scale NP dominantly coupled to the third family. This setup delivers
  U(2) flavor symmetries that allow one to start explaining flavor at the T
 eV scale\, while simultaneously improving compatibility with the aforement
 ioned bounds. \n\nIn all such models that also seek to address the hierarc
 hy problem or the flavor puzzle\, there are unavoidably new particles with
  sizable couplings to the Higgs. Integrating out these heavy particles gen
 erates contributions to SMEFT operators that modify EW precision observabl
 es\, which are precisely measured on the Z- and W-poles. We therefore have
  a triad of bounds that all models of this type must pass: flavor\, direct
  collider searches\, and EW precision tests.\n\nThe SMEFT in the U(2)^5 sy
 mmetric limit contains only 124 independent operators. This makes an exhau
 stive phenomenological study tractable\, where one can place bounds on all
  of these operators from each prong of the triad. I will show that while f
 lavor bounds depend on how U(2) is broken\, the U(2) symmetric limit is su
 fficient for EW and collider parts of the triad\, which most strongly cons
 train the flavor conserving parts of the operators. Additionally\, importa
 nt effects come from resummed RGE\, in particular from operators with thir
 d-family quarks running strongly into Higgs operators constrained on the Z
 -pole. Finally\, I present projections showing how the FCC-ee Z-pole run w
 ill indirectly probe a plethora of operators via their unavoidable RG mixi
 ng into Higgs operators.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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