Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Fits to non-supersymmetric SO(10) models with type I and II seesaw mechanisms using renormalization group evolution
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21, SE-10691 Stockholm, Sweden.;Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland..ORCID iD: 0000-0002-3525-8349
KTH, School of Engineering Sciences (SCI), Physics, Theoretical Particle Physics. AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21, SE-10691 Stockholm, Sweden..
2019 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 6, article id 085Article in journal (Refereed) Published
Abstract [en]

We consider numerical fits to non-supersymmetric SO(10)-based models in which neutrino mass is generated by the type-I or type-II seesaw mechanism or a combination of both. The fits are performed with a sophisticated top-down procedure, taking into account the renormalization group equations of the gauge and Yukawa couplings, integrating out relevant degrees of freedom at their corresponding mass scales, and using recent data for the Standard Model observables. We find acceptable fits for normal neutrino mass ordering only and with neutrino mass generated by either type-I seesaw only or a combination of types I and II seesaw in which type-I seesaw is dominant. Furthermore, we find predictions from the best fit regarding the small neutrino masses, the effective neutrinoless double beta decay mass, and the leptonic CP-violating phase. Finally, we show that the fits are rather insensitive to the chosen value of the unification scale.

Place, publisher, year, edition, pages
SPRINGER , 2019. no 6, article id 085
Keywords [en]
Beyond Standard Model, GUT, Neutrino Physics
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-255188DOI: 10.1007/JHEP06(2019)085ISI: 000472210600002Scopus ID: 2-s2.0-85067629668OAI: oai:DiVA.org:kth-255188DiVA, id: diva2:1348425
Note

QC 20190904

Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-09-18Bibliographically approved
In thesis
1. Phenomenology of SO(10) Grand Unified Theories
Open this publication in new window or tab >>Phenomenology of SO(10) Grand Unified Theories
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Although the Standard Model (SM) of particle physics describes observations well, there are several shortcomings of it. The most crucial of these are that the SM cannot explain the origin of neutrino masses and the existence of dark matter. Furthermore, there are several aspects of it that are seemingly ad hoc, such as the choice of gauge group and the cancellation of gauge anomalies.

These shortcomings point to a theory beyond the SM. Although there are many proposed models for physics beyond the SM, in this thesis, we focus on grand unified theories based on the SO(10) gauge group. It predicts that the three gauge groups in the SM unify at a higher energy into one, which contains the SM as a subgroup. We focus on the Yukawa sector of these models and investigate the extent to which the observables such as fermion masses and mixing parameters can be accommodated into different models based on the SO(10) gauge group. Neutrino masses and leptonic mixing parameters are particularly interesting, since SO(10) models naturally embed the seesaw mechanism.

The difference in energy scale between the electroweak scale and the scale of unification spans around 14 orders of magnitude. Therefore, one must relate the parameters of the SO(10) model to those of the SM through renormalization group equations. We investigate this for several different models by performing fits of SO(10) models to fermion masses and mixing parameters, taking into account thresholds at which heavy right-handed neutrinos are integrated out of the theory. Although the results are in general dependent on the particular model under consideration, there are some general results that appear to hold true. The observ- ables of the Yukawa sector can in general be accommodated into SO(10) models only if the neutrino masses are normally ordered and that inverted ordering is strongly disfavored. We find that the observable that provides the most tension in the fits is the leptonic mixing angle θ2l3, whose value is consistently favored to be lower in the fits than the actual value. Furthermore, we find that numerical fits to the data favor type-I seesaw over type-II seesaw for the generation of neutrino masses.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2019. p. 84
Series
TRITA-SCI-FOU ; 2019;38
Keywords
Grand unified theories, Renormalization group equations, Neutrino masses, Gauge coupling unification
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-259605 (URN)978-91-7873-269-2 (ISBN)
Presentation
2019-10-17, FB42, Roslagstullsbacken 21, AlbaNova universitetscentrum, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

Examinator: Professor Mark Pearce, Fysik, KTH

Available from: 2019-09-19 Created: 2019-09-18 Last updated: 2019-09-19Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Ohlsson, TommyPernow, Marcus

Search in DiVA

By author/editor
Ohlsson, TommyPernow, Marcus
By organisation
Particle and Astroparticle PhysicsTheoretical Particle Physics
In the same journal
Journal of High Energy Physics (JHEP)
Subatomic Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 3 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf