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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2914
DTSTART:20130212T220000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T133039Z
LAST-MODIFIED:20130212T050541Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Higgs to di-photon decay with new vector fermions\, Theory Sem
 inar (High Energy/Cosmology)\, Pedro Schwaller\, Argonne National Labo
 ratory
DESCRIPTION:The discovery of the Higgs boson opens the possibility to 
 probe new physics scenarios by analyzing Higgs production and decay ra
 tes. The loop induced decay to photon pairs is particularly sensitive 
 to new physics contributions\, and a possible enhanced rate for this d
 ecay has generated some interest in models that can explain it. I will
  present an extension of the SM with a family of vector-like leptons. 
 Not only can this model explain an enhanced di-photon decay rate of th
 e Higgs\, but it also provides a dark matter candidate while being in 
 agreement with electroweak precision constraints. The necessarily larg
 e Yukawa couplings affect the running of the Higgs self coupling\, suc
 h that an ultra violet (UV) completion is needed below the 10 TeV scal
 e. A promising solution is to embed the model into a supersymmetric gr
 and unified theory. Using RGEs upper bounds on the lepton Yukawa coupl
 ings can be derived\, which limits the possible enhancement of the di-
 photon rate. Additional enhancement can be obtained if also the new sl
 eptons are light\, and I explore the parameter regions that are compat
 ible with GUT-scale vacuum stability\, LEP limits and electroweak prec
 ision constraints.
URL:https://www.physics.wisc.edu/events/?id=2914
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