After a discussion of the hierarchy problem of the Fermi scale, we study the flavour and Higgs boson(s) phenomenology of new physics close to it, both in general and in the specifi c cases of Supersymmetry and composite Higgs models. First, we promote the approximate U(2)3 symmetry exhibited by the quark sector of the Standard Model to be a more fundamental symmetry of Nature, and explore its phenomenological consequences from an effective fi eld theory point of view. We also study the embedding of natural Supersymmetry within the U(2)3 framework, focusing in particular on the pattern of flavour and CP violation in B decays. Then we consider the CP-even scalar sector of the next-to-minimal supersymmetric Standard Model. We quantify the impact of current and foreseen measurements of the Higgs boson signal strengths on the physical parameters, deriving analytical relations for this purpose, and we outline a possible overall strategy to search for the other Higgs scalars. Finally we analyze the constraints from flavour and electroweak precison tests on composite Higgs models, for di fferent representations of the composite fermions, and comparing the case of an anarchic flavour structure to models with a U(3)3 and a U(2)3 flavour symmetry.

Flavour and Higgs physics near the Fermi scale / Sala, Filippo; relatore: Barbieri, Riccardo; Scuola Normale Superiore, 27-Nov-2013.

Flavour and Higgs physics near the Fermi scale

Sala, Filippo
2013

Abstract

After a discussion of the hierarchy problem of the Fermi scale, we study the flavour and Higgs boson(s) phenomenology of new physics close to it, both in general and in the specifi c cases of Supersymmetry and composite Higgs models. First, we promote the approximate U(2)3 symmetry exhibited by the quark sector of the Standard Model to be a more fundamental symmetry of Nature, and explore its phenomenological consequences from an effective fi eld theory point of view. We also study the embedding of natural Supersymmetry within the U(2)3 framework, focusing in particular on the pattern of flavour and CP violation in B decays. Then we consider the CP-even scalar sector of the next-to-minimal supersymmetric Standard Model. We quantify the impact of current and foreseen measurements of the Higgs boson signal strengths on the physical parameters, deriving analytical relations for this purpose, and we outline a possible overall strategy to search for the other Higgs scalars. Finally we analyze the constraints from flavour and electroweak precison tests on composite Higgs models, for di fferent representations of the composite fermions, and comparing the case of an anarchic flavour structure to models with a U(3)3 and a U(2)3 flavour symmetry.
27-nov-2013
FIS/04 FISICA NUCLEARE E SUBNUCLEARE
Fisica
Fermi scale
Higgs physics
Physics
supersymmetry
Scuola Normale Superiore
Barbieri, Riccardo
File in questo prodotto:
File Dimensione Formato  
Sala-Filippo-Phd-2013-Scienze.pdf

accesso aperto

Descrizione: doctoral thesis full text
Tipologia: Tesi PhD
Licenza: Solo Lettura
Dimensione 10.03 MB
Formato Adobe PDF
10.03 MB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/85890
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact