eprintid: 28620
rev_number: 16
eprint_status: archive
userid: 5273
dir: disk0/00/02/86/20
datestamp: 2020-07-15 14:10:36
lastmod: 2020-07-16 12:45:48
status_changed: 2020-07-15 14:10:36
type: doctoralThesis
metadata_visibility: show
creators_name: Blasi, Simone
title: Hierarchies and new symmetries: from flavored axions to composite Higgs
subjects: ddc-530
divisions: i-130001
adv_faculty: af-13
abstract: We investigate possible extensions of the Standard Model according to either elementary or composite nature of the Higgs boson. In the former scenario, we present a model of flavored axion Higgs unification in which electroweak symmetry breaking occurs dynamically and selects a small region for the axion decay constant that will be fully tested at forthcoming dark matter and flavor experiments. Moreover, if the Higgs is elementary, yukawa couplings are regarded as fundamental interactions: this relates to possible UV completions based on asymptotic safety for which we provide new insights by studying models containing a large multiplicity of fermion fields. Finally, we introduce a new realization of a composite Higgs that resolves the tension with null-signals of new physics at the LHC. It is based on a new symmetry structure that we call soft breaking, whose realization in the context of a warped extra dimension is particularly simple. When combined with other possible symmetries this allows for a completely natural model to emerge predicting composite resonances above 2 TeV with fine-tuning at the minimum 10% already implied by LEP and thus restoring naturalness in the light of the LHC data.
date: 2020
id_scheme: DOI
id_number: 10.11588/heidok.00028620
ppn_swb: 1724941992
own_urn: urn:nbn:de:bsz:16-heidok-286200
date_accepted: 2020-07-07
advisor: HASH(0x55d997bcbef8)
language: eng
bibsort: BLASISIMONHIERARCHIE2020
full_text_status: public
place_of_pub: Heidelberg
citation:   Blasi, Simone  (2020) Hierarchies and new symmetries: from flavored axions to composite Higgs.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/28620/1/thesis.pdf_dl%3D0