Lepton favor violation in supersymmetric low-scale seesaw models

doctoral thesis

• Title (croatian): Nesačuvanje leptonskog okusa u supersimetričnim modelima njihalice na niskoj skali
• Author: Luka Popov
• Mentor: Amon Ilakovac (mentor)
• Committee member: Krešimir Kumerički (predsjednik povjerenstva)
• Committee member: Vuko Brigljević (član povjerenstva)
• Committee member: Amon Ilakovac (član povjerenstva)
• Committee member: Dubravko Klabučar (član povjerenstva)
• Committee member: Mirko Planinić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2013-12-12, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics
• Universal decimal classification (UDC): 53 - Physics

Abstract

The minimal supersymmetric standard model with a low scale see-saw mechanism is presented. Within this framework, the lepton flavour violation in the charged lepton sector is thoroughly studied. Special attention is paid to the individual loop contributions due to the heavy neutrinos N1,2,3, sneutrinos e N1,2,3 and soft SUSY-breaking terms. For the first time, the complete set of box diagrams is included, in addition to the photon and Z-boson mediated interactions. The complete set of chiral amplitudes and their associate formfactors related to the neutrinoless three-body charged lepton flavor violating decays of the muon and tau, such as µ → eee, τ → µµµ, τ → eµµ and τ → eeµ as well as the coherent µ → e conversion in nuclei, were derived. The obtained analytical results are general and can be applied to most of the New Physics models with charged lepton flavor violation. This systematic analysis has revealed the existence of two new box form factors, which have not been considered before in the existing literature in this area of physics. In the same model, the systematic study of one-loop contributions to the muon anomalous magnetic dipole moment aµ and the electron electric dipole moment de is performed. Special attention is paid to the effect of the sneutrino soft SUSY-breaking parameters, Bv and Av, and their universal CP phases (θ and ϕ) on aµ and de.

Abstract (croatian)

Izložen je minimalni supersimetrični standardni model s modelom njihalice na niskoj skali. U okviru tog modela detaljno je izučeno narušenje leptonskog okusa u nabijenom leptonskom sektoru. Posebna pažnja posvećena je pojedinim doprinosima petlji koji dolaze od teških neutrina N1,2,3, sneutrina e N1,2,3 i članova koji mekano lome supersimetriju. Po prvi put uključen je i cjelovit skup pravokutnih dijagrama, zajedno s fotonskim i Z-bozonskim interakcijama. Izveden je cjelovit skup kiralnih amplituda i pridruženih im form-faktora povezanih s tročestičnim CLFV raspadima miona i tau-leptona bez neutrina, kao što su µ → eee, τ → µµµ, τ → eµµ i τ → eeµ te µ → e prijelazi na atomskim jezgrama. Dobiveni analitički rezultati su općeniti i mogu se primijeniti na većinu modela nove fizike koji uključuju narušenje nabijenog leptonskog okusa. Ova sustavna analiza pokazala je postojanje dodatnih form-faktora koji proizlaze iz pravokutnih dijagrama, koji u postojećoj literaturi iz ovog područja fizike nisu bili uzimani u obzir. U istom modelu, sustavno su izučeni doprinosi na razini jedne petlje anomalnom magnetskom dipolnom momentu miona aµ i električnom dipolnom momentu elektrona de. Posebna pažnja posvećena je učinku sneutrinskih parametara koji mekano lome supersimetriju, Bv and Av, kao i njihovim univerzalnim CP fazama (θ i ϕ) na ponašanje aµ i de.

• Keywords: lepton flavor violation; supersymmetry; MSSM; seesaw mechanism; low-scale seesaw; lepton dipole Moments
• Keywords (croatian): narušenje leptonskog okusa; supersimetrija; MSSM; mehanizam njihalice na niskoj skali; leptonski dipolni momenti
• Language: english
• URN:NBN: urn:nbn:hr:217:106351
• Study programme: Title: Physics; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje fizika (doktor/doktorica znanosti, područje prirodnih znanosti, polje fizika)
• Type of resource: Text
• Extent: 135 str.
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-08-23 09:55:41