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Signatures from an extra-dimensional seesaw model
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0002-3525-8349
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
2010 (English)In: Physical Review D, ISSN 1550-7998, Vol. 82, no 4, 045023- p.Article in journal (Refereed) Published
Abstract [en]

We study the generation of small neutrino masses in an extra-dimensional model, where singlet fermions are allowed to propagate in the extra dimension, while the standard model particles are confined to a brane. Motivated by the fact that extra-dimensional models are nonrenormalizable, we truncate the Kaluza-Klein towers at a maximal Kaluza-Klein number. This truncation, together with the structure of the bulk Majorana mass term, motivated by the Sherk-Schwarz mechanism, implies that the Kaluza-Klein modes of the singlet fermions pair to form Dirac fermions, except for a number of unpaired Majorana fermions at the top of each tower. These heavy Majorana fermions are the only sources of lepton number breaking in the model, and similarly to the type-I seesaw mechanism, they naturally generate small masses for the left-handed neutrinos. The lower Kaluza-Klein modes mix with the light neutrinos, and the mixing effects are not suppressed with respect to the light-neutrino masses. Compared to conventional fermionic seesaw models, such mixing can be more significant. We study the signals of this model at the Large Hadron Collider, and find that the current low-energy bounds on the nonunitarity of the leptonic mixing matrix are strong enough to exclude an observation.

Place, publisher, year, edition, pages
The American Physical Society , 2010. Vol. 82, no 4, 045023- p.
Keyword [en]
NEUTRINO OSCILLATIONS, PHENOMENOLOGICAL IMPLICATIONS, CP-VIOLATION, MASSES, UNIVERSE, MIXINGS, PHYSICS, LHC
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-26840DOI: 10.1103/PhysRevD.82.045023ISI: 000281070800010OAI: oai:DiVA.org:kth-26840DiVA: diva2:374598
Funder
EU, FP7, Seventh Framework ProgrammeSwedish Research Council, 621-2008-4210
Note
QC 20101206 Denna artikel är en granskad och publicerad version av manuskriptet "Non-unitary neurtino mixing from an extra-dimensional seesaw model" som hör till avhandlingen "Astrophysical and Collider Signatures of Extra Dimensions". This article is a peer-reviewed and published version of the manuscript "Non-unitary neurtino mixing from an extra-dimensional seesaw model" which is a part of the doctoral dissertation "Astrophysical and Collider Signatures of Extra Dimensions".Available from: 2011-06-17 Created: 2010-11-29 Last updated: 2012-04-27Bibliographically approved
In thesis
1. Particle Phenomenology of Compact Extra Dimensions
Open this publication in new window or tab >>Particle Phenomenology of Compact Extra Dimensions
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is an investigation of the subject of extra dimensions in particle physics. In recent years, there has been a large interest in this subject. In particular, a number of models have been suggested that provide solutions to some of the problem with the current Standard Model of particle physics. These models typically give rise to experimental signatures around the TeV energy scale, which means that they could be tested in the next generation of high-energy experiments, such as the LHC. Among the most important of these models are the universal extra dimensions model, the large extra dimensions model by Arkani-Hamed, Dimopolous, and Dvali, and models where right-handed neutrinos propagate in the extra dimensions.

In the thesis, we study phenomenological aspects of these models, or simple modifications of them. In particular, we focus on Kaluza–Klein dark matter in universal extra dimensions models, different aspects of neutrino physics in higher dimensions, and collider phenomenology of extra dimensions. In addition, we consider consequences of the enhanced renormalization group running of physical parameters in higher-dimensional models.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. xiv, 98 p.
Series
Trita-FYS, ISSN 0280-316X ; 2012:16
Keyword
Higher-dimensional quantum field theories, universal extra dimensions, Arkani-Hamed–Dimopolous–Dvali (ADD) model, hierarchy problem, Kaluza– Klein dark matter, neutrino mass, seesaw mechanism, leptonic mixing, renormalization group running, collider phenomenology, Large Hadron Collider
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-93749 (URN)978-91-7501-305-3 (ISBN)
Public defence
2012-05-11, Sal FB53, Albanova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20120427Available from: 2012-04-27 Created: 2012-04-25 Last updated: 2012-04-27Bibliographically approved

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Publisher's full textPhysical Review Dhttp://arxiv.org/abs/1003.0669

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