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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-8158
DTSTART:20230426T180000Z
DTEND:20230426T193000Z
DTSTAMP:20260405T174721Z
LAST-MODIFIED:20230424T025026Z
LOCATION:Chamberlin 5280
SUMMARY:Status of negative coupling modifiers for extended Higgs secto
 rs\, Theory Seminar (High Energy/Cosmology)\, Carlos Henrique de Lima\
 , Carleton University
DESCRIPTION: In this work\, we study the status of negative coupling m
 odifiers in extended Higgs sectors\, focusing on the ratio of coupling
  modifiers that probes custodial symmetry violation λWZ=κW/κZ. Higg
 s sectors with multiplets larger than doublets are the only weakly cou
 pled models that give tree-level modifications to λWZ\, and we explor
 e all such models allowed by the constraint from the ρ parameter and 
 perturbative unitarity. This class of models has a custodial symmetry 
 violating potential\, while the vacuum configuration preserves the sym
 metry. We apply precision measurements from ATLAS and CMS and show tha
 t each data set can exclude a vast set of models with λWZ<0 at greate
 r than 95\\% confidence level. We give evidence that λWZ<0 is exclude
 d in all weakly coupled models. 
URL:https://www.physics.wisc.edu/events/?id=8158
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