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SUMMARY:Constraints on multi-scalar models
DTSTART:20261012T140000Z
DTEND:20261012T160000Z
DTSTAMP:20260930T085403Z
UID:aad6ddb2-f239-4f31-837d-4cc8bb7f6691
SEQUENCE:2
CREATED:20260929T094916Z
DESCRIPTION:The Standard Model of particle physics is one of the most succ
 essful theories ever developed. Although the Standard Model provides an ac
 curate 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 shortcomin
 gs provide strong motivation for considering extensions of the Standard Mo
 del.In the first part of this work\, we present a comprehensive study of p
 erturbative unitarity bounds in the gauge-scalar sectors of models contain
 ing additional scalar doublets\, neutral singlets\, or charged singlets. S
 uch scalar sectors arise naturally in many Beyond the Standard Model scena
 rios 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 req
 uired to determine the perturbative unitarity constraints. We also develop
 ed a Mathematica package\, BounDS\, which automates the implementation of 
 these results. This work has been published in the International Journal o
 f Modern Physics A (IJMPA).In the second part of this work\, we investigat
 e CP Violation (CPV) in couplings\, focusing on the potential role of a co
 mplex top Yukawa coupling as a source of CPV. We analyse how such coupling
 s could arise in effective field theory frameworks and study their phenome
 nological consequences for Higgs decays and interactions.
LAST-MODIFIED:20260929T094950Z
LOCATION:Sala P3 (Piso 1 do Pavilhão de Matemática) do IST
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/constraints-on-multi-scala
 r-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 ele
 mentary particles and their interactions\, it leaves several fundamental q
 uestions unanswered\, including the origin of the baryon asymmetry of the 
 Universe\, the nature of Dark Matter\, and the mechanism responsible for g
 enerating neutrino masses. These shortcomings provide strong motivation fo
 r 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 con
 taining additional scalar doublets\, neutral singlets\, or charged singlet
 s. Such scalar sectors arise naturally in many Beyond the Standard Model s
 cenarios and are particularly common in theories that address the dark mat
 ter problem.<br/><br/> We derive a complete classification of these models
  and identify a minimal set of scattering matrices that contains all the i
 nformation required to determine the perturbative unitarity constraints. W
 e also developed a Mathematica package\, BounDS\, which automates the impl
 ementation of these results. This work has been published in the <i>Intern
 ational Journal of Modern Physics A</i> (IJMPA).<br/></p><p data-block-key
 ="fnb3m">In the second part of this work\, we investigate CP Violation (CP
 V) in couplings\, focusing on the potential role of a complex top Yukawa c
 oupling as a source of CPV. We analyse how such couplings could arise in e
 ffective field theory frameworks and study their phenomenological conseque
 nces for Higgs decays and interactions.</p>
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