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SUMMARY:Constraints on multi-scalar models
DTSTART:20261012T140000Z
DTEND:20261012T160000Z
DTSTAMP:20260930T120712Z
UID:aad6ddb2-f239-4f31-837d-4cc8bb7f6691
SEQUENCE:1
CREATED:20260929T094906Z
DESCRIPTION: The Standard Model of particle physics is one of the most suc
 cessful theories ever developed. Although the Standard Model provides an a
 ccurate description of known elementary particles and their interactions\,
  it leaves several fundamental questions unanswered\, including the origin
  of the baryon asymmetry of the Universe\, the nature of Dark Matter\, and
  the mechanism responsible for generating neutrino masses. These shortcomi
 ngs provide strong motivation for considering extensions of the Standard M
 odel.In the first part of this work\, we present a comprehensive study of 
 perturbative unitarity bounds in the gauge-scalar sectors of models contai
 ning additional scalar doublets\, neutral singlets\, or charged singlets. 
 Such scalar sectors arise naturally in many Beyond the Standard Model scen
 arios and are particularly common in theories that address the dark matter
  problem. We derive a complete classification of these models and identify
  a minimal set of scattering matrices that contains all the information re
 quired to determine the perturbative unitarity constraints. We also develo
 ped a Mathematica package\, BounDS\, which automates the implementation of
  these results. This work has been published in the International Journal 
 of Modern Physics A (IJMPA).In the second part of this work\, we investiga
 te CP Violation (CPV) in   couplings\, focusing on the potential role of a
  complex top Yukawa coupling as a source of CPV. We analyse how such coupl
 ings could arise in effective field theory frameworks and study their phen
 omenological consequences for Higgs decays and interactions.
LAST-MODIFIED:20260929T094906Z
LOCATION:Sala P3 (Piso 1 do Pavilhão de Matemática) do IST
URL:http://df.vps.tecnico.ulisboa.pt/en/events/constraints-on-multi-scalar
 -models/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="pegg9"> The Standard Model
  of particle physics is one of the most successful theories ever developed
 . Although the Standard Model provides an accurate description of known el
 ementary particles and their interactions\, it leaves several fundamental 
 questions unanswered\, including the origin of the baryon asymmetry of the
  Universe\, the nature of Dark Matter\, and the mechanism responsible for 
 generating neutrino masses. These shortcomings provide strong motivation f
 or considering extensions of the Standard Model.<br/></p><p data-block-key
 ="846p1">In the first part of this work\, we present a comprehensive study
  of perturbative unitarity bounds in the gauge-scalar sectors of models co
 ntaining additional scalar doublets\, neutral singlets\, or charged single
 ts. Such scalar sectors arise naturally in many Beyond the Standard Model 
 scenarios and are particularly common in theories that address the dark ma
 tter problem. <br/><br/>We derive a complete classification of these model
 s and identify a minimal set of scattering matrices that contains all the 
 information required to determine the perturbative unitarity constraints. 
 We also developed a Mathematica package\, BounDS\, which automates the imp
 lementation of these results. This work has been published in the <i>Inter
 national Journal of Modern Physics A</i> (IJMPA).<br/></p><p data-block-ke
 y="fnb3m">In the second part of this work\, we investigate CP Violation (C
 PV) in   couplings\, focusing on the potential role of a complex top Yukaw
 a coupling as a source of CPV. We analyse how such couplings could arise i
 n effective field theory frameworks and study their phenomenological conse
 quences for Higgs decays and interactions.</p>
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