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A minimal non-supersymmetric SO(10) model with Peccei-Quinn symmetry
KTH, School of Engineering Sciences (SCI), Physics. AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21, SE-10691 Stockholm, Sweden..
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. AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, Roslagstullsbacken 21, SE-10691 Stockholm, Sweden..
2019 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 792, p. 251-257Article in journal (Refereed) Published
Abstract [en]

We present a minimal non-supersymmetric SO(10) GUT breaking directly to the Standard Model gauge group. Precise gauge coupling unification is achieved due to the presence of two color-octet scalars, one of which is accessible to LHC searches. Proton lifetime is predicted to be below 4.5 x 10(34) years, which is within the projected five-year sensitivity of the proposed Hyper-Kamiokande experiment. We find that the Standard Model observables are reproduced to a reasonable accuracy in a numerical fit, which also predicts the unknown neutrino parameters. Finally, the two scalar representations stabilize the electroweak vacuum and the dark matter is comprised of axions.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 792, p. 251-257
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-251700DOI: 10.1016/j.physletb.2019.03.045ISI: 000466802100038Scopus ID: 2-s2.0-85063758281OAI: oai:DiVA.org:kth-251700DiVA, id: diva2:1316663
Note

QC 20190520

Available from: 2019-05-20 Created: 2019-05-20 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

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Boucenna, Sofiane M.Ohlsson, Tommy

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