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SUMMARY:Minimal U(1) two-Higgs-doublet models for quark and lepton flavour
DTSTART:20241206T140000Z
DTEND:20241206T160000Z
DTSTAMP:20260815T190817Z
UID:939ead17-a13c-43cf-b1dd-46b7e48c8888
SEQUENCE:1
CREATED:20241204T092416Z
DESCRIPTION: The Standard Model (SM) of particle physics describes numerou
 s phenomena related to the interactions among the fundamental constituents
  of matter with remarkable precision. However\, the observations of neutri
 no oscillations imply the existence of massive neutrinos and lepton mixing
 \, which must be accounted through extensions of the SM. Additionally\, th
 e SM lacks a guiding principle to explain the observed fermion masses and 
 their mixing -- this is often referred to as the flavour puzzle.In this th
 esis\, we address the flavour puzzle within the 2HDM\, supplemented by hor
 izontal Abelian symmetries and neutrino mass generation through effective 
 Weinberg operators. To this end\, we conduct a systematic analysis to dete
 rmine the minimal quark and lepton flavour patterns imposed by these symme
 tries\, compatible with the observed fermion masses\, mixing\, and CP viol
 ation phases. We determine four minimal models for quarks\, where the numb
 er of independent parameters matches the number of observables. For the le
 pton sector\, three minimal predictive models are identified. Namely\, we 
 find scenarios with a preference for the upper/lower octant of the    atmo
 spheric mixing angle\, that exhibit lower bounds on the lightest neutrino 
 masses currently probed by cosmology and testable at future neutrinoless d
 ouble beta decay experiments\, even for a normally-ordered neutrino masses
 . We investigate the phenomenology of each model taking into account all r
 elevant theoretical\, electroweak precision observables\, scalar sector co
 nstraints\, as well as stringent quark flavour processes such as   \,    a
 nd meson oscillations\, and the charged lepton flavour-violating decays   
  and . We show that\, in some cases\, Abelian flavour symmetries provide a
  natural framework to suppress flavour-changing neutral couplings and lead
  to scenarios featuring heavy neutral/charged scalar masses below the TeV 
 scale within the reach of current experiments.
LAST-MODIFIED:20241204T092416Z
LOCATION:Sala de Seminários do DF\,  Pavilhão de Física\, 2º piso
URL:http://df.vps.tecnico.ulisboa.pt/en/events/minimal-u1-two-higgs-double
 t-models-for-quark-and-lepton-flavour/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="mbjli"> The Standard Model
  (SM) of particle physics describes numerous phenomena related to the inte
 ractions among the fundamental constituents of matter with remarkable prec
 ision. However\, the observations of neutrino oscillations imply the exist
 ence of massive neutrinos and lepton mixing\, which must be accounted thro
 ugh extensions of the SM. Additionally\, the SM lacks a guiding principle 
 to explain the observed fermion masses and their mixing -- this is often r
 eferred to as the flavour puzzle.<br/><br/></p><p data-block-key="c68p0">I
 n this thesis\, we address the flavour puzzle within the 2HDM\, supplement
 ed by horizontal Abelian symmetries and neutrino mass generation through e
 ffective Weinberg operators. To this end\, we conduct a systematic analysi
 s to determine the minimal quark and lepton flavour patterns imposed by th
 ese symmetries\, compatible with the observed fermion masses\, mixing\, an
 d CP violation phases. We determine four minimal models for quarks\, where
  the number of independent parameters matches the number of observables.<b
 r/><br/> For the lepton sector\, three minimal predictive models are ident
 ified. Namely\, we find scenarios with a preference for the upper/lower oc
 tant of the    atmospheric mixing angle\, that exhibit lower bounds on the
  lightest neutrino masses currently probed by cosmology and testable at fu
 ture neutrinoless double beta decay experiments\, even for a normally-orde
 red neutrino masses. We investigate the phenomenology of each model taking
  into account all relevant theoretical\, electroweak precision observables
 \, scalar sector constraints\, as well as stringent quark flavour processe
 s such as   \,    and meson oscillations\, and the charged lepton flavour-
 violating decays    and . We show that\, in some cases\, Abelian flavour s
 ymmetries provide a natural framework to suppress flavour-changing neutral
  couplings and lead to scenarios featuring heavy neutral/charged scalar ma
 sses below the TeV scale within the reach of current experiments.</p>
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