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UID:UW-Physics-Event-8159
DTSTART:20230503T180000Z
DTEND:20230503T193000Z
DTSTAMP:20260414T031159Z
LAST-MODIFIED:20230417T133352Z
LOCATION:Chamberlin 5280
SUMMARY:Building non-vanilla QCD axion models\, Theory Seminar (High E
 nergy/Cosmology)\, Felix Yu\, Fermilab
DESCRIPTION:In [1] and [2]\, my co-authors and I revisit the the field
  theory of axion model building from two separate perspectives.  We fi
 rst considered [1] the effects of small-size instantons arising from e
 nlarged color gauge groups on the QCD axion mass\, reaffirming earlier
  results that QCD axion masses can be parametrically heavier than vani
 lla models when the confinement effects of the extended color group sy
 mmetry contribute to the Peccei-Quinn (PQ) breaking.  Notably\, we dis
 cuss an improvement of the vanilla chiral Lagrangian that readily inco
 rporates non-vanilla 't Hooft determinantal operators.  In [2]\, we pr
 esent the "Anarchic Axion" model where a possible soft-breaking of PQ 
 symmetry is included in the scalar potential.  Depending on the phase 
 and magnitude of the soft-breaking term\, an arbitrarily light QCD axi
 on remains to solve the strong CP problem\, albeit at the expense of i
 ncreasing fine tuning.  Besides expanding the axion parameter space be
 yond the vanilla QCD axion band\, we have also discussed the phenomeno
 logy of axion-like particle effective field theories when the Standard
  Model is extended to include a gauged baryon number symmetry\, offeri
 ng new collider signatures for ALPs and Z' bosons [3].
\n
\n[1] Kivel\
 , Laux\, FY\, [JHEP 11(2022) 088\, arXiv:2207.08740]
\n[2] Elahi\, Elo
 r\, Kivel\, Laux\, Najjari\, FY [arXiv:2301.08760]
\n[3] Kivel\, Laux\
 , FY [JHEP 03 (2023) 078\, arXiv:2211.12155]
\n
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URL:https://www.physics.wisc.edu/events/?id=8159
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