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Signatures from an extra-dimensional seesaw model
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik, Teoretisk partikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik, Teoretisk partikelfysik.ORCID-id: 0000-0002-3525-8349
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik, Teoretisk partikelfysik.
2010 (engelsk)Inngår i: Physical Review D, ISSN 1550-7998, Vol. 82, nr 4, s. 045023-Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
The American Physical Society , 2010. Vol. 82, nr 4, s. 045023-
Emneord [en]
NEUTRINO OSCILLATIONS, PHENOMENOLOGICAL IMPLICATIONS, CP-VIOLATION, MASSES, UNIVERSE, MIXINGS, PHYSICS, LHC
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-26840DOI: 10.1103/PhysRevD.82.045023ISI: 000281070800010OAI: oai:DiVA.org:kth-26840DiVA, id: diva2:374598
Forskningsfinansiär
EU, FP7, Seventh Framework ProgrammeSwedish Research Council, 621-2008-4210
Merknad
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".Tilgjengelig fra: 2011-06-17 Laget: 2010-11-29 Sist oppdatert: 2012-04-27bibliografisk kontrollert
Inngår i avhandling
1. Particle Phenomenology of Compact Extra Dimensions
Åpne denne publikasjonen i ny fane eller vindu >>Particle Phenomenology of Compact Extra Dimensions
2012 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2012. s. xiv, 98
Serie
Trita-FYS, ISSN 0280-316X ; 2012:16
Emneord
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
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-93749 (URN)978-91-7501-305-3 (ISBN)
Disputas
2012-05-11, Sal FB53, Albanova, Roslagstullsbacken 21, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
QC 20120427Tilgjengelig fra: 2012-04-27 Laget: 2012-04-25 Sist oppdatert: 2012-04-27bibliografisk kontrollert

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