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
Renormalization group running of neutrino parameters in the inverse seesaw model
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
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. 81, no 11, 116006- p.Article in journal (Refereed) Published
Abstract [en]

We perform a detailed study of the renormalization group equations in the inverse seesaw model. Especially, we derive compact analytical formulas for the running of the neutrino parameters in the standard model and the minimal supersymmetric standard model, and illustrate that, due to large Yukawa coupling corrections, significant running effects on the leptonic mixing angles can be naturally obtained in the proximity of the electroweak scale, perhaps even within the reach of the LHC. In general, if the mass spectrum of the light neutrinos is nearly degenerate, the running effects are enhanced to experimentally accessible levels, well suitable for the investigation of the underlying dynamics behind the neutrino mass generation and the lepton flavor structure. In addition, the effects of the seesaw thresholds are discussed, and a brief comparison to other seesaw models is carried out.

Place, publisher, year, edition, pages
The American Physical Society , 2010. Vol. 81, no 11, 116006- p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-27231DOI: 10.1103/PhysRevD.81.116006ISI: 000279386200001Scopus ID: 2-s2.0-77954388448OAI: oai:DiVA.org:kth-27231DiVA: diva2:381866
Funder
Swedish Research Council, 621-2008-4210
Note
QC 20101229Available from: 2011-09-26 Created: 2010-12-09 Last updated: 2013-08-30Bibliographically approved
In thesis
1. Predictions of Effective Models in Neutrino Physics
Open this publication in new window or tab >>Predictions of Effective Models in Neutrino Physics
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Experiments on neutrino oscillations have confirmed that neutrinos have small, but non-zero masses, and that the interacting neutrino states do not have definite masses, but are mixtures of such states.The seesaw models make up a group of popular models describing the small neutrino masses and the corresponding mixing.In these models, new, heavy fields are introduced and the neutrino masses are suppressed by the ratio between the electroweak scale and the large masses of the new fields. Usually, the new fields introduced have masses far above the electroweak scale, outside the reach of any foreseeable experiments, making these versions of seesaw models essentially untestable. However, there are also so-called low-scale seesaw models, where the new particles have masses above the electroweak scale, but within the reach of future experiments, such as the LHC.In quantum field theories, quantum corrections generally introduce an energy-scale dependence on all their parameters, described by the renormalization group equations. In this thesis, the energy-scale dependence of the neutrino parameters in two low-scale seesaw models, the low-scale type I and inverse seesaw models, are considered. Also, the question of whether the neutrinos are Majorana particles, \ie , their own antiparticles, has not been decided experimentally. Future experiments on neutrinoless double beta decay could confirm the Majorana nature of neutrinos. However, there could also be additional contributions to the decay, which are not directly related to neutrino masses. We have investigated the possible future bounds on the strength of such additional contributions to neutrinoless double beta decay, depending on the outcome of ongoing and planned experiments related to neutrino masses.

Place, publisher, year, edition, pages
Stockholm, Sweden: KTH Royal Institute of Technology, 2011. xii, 64 p.
Series
Trita-FYS, ISSN 0280-316X ; 2011:31
Keyword
Neutrino mass, lepton mixing, Majorana neutrinos, effective field theory, Weinberg operator, seesaw models, low-scale seesaw models, inverse seesaw, right-handed neutrinos, renormalization group, threshold effects, neutrinoless double beta decay
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-35267 (URN)978-91-7501-057-1 (ISBN)
Presentation
2011-08-26, FB53, KTH, Roslagstullsbacken 21, Stockholm, Sweden, 13:00 (English)
Opponent
Supervisors
Note
QC 20110812Available from: 2011-08-12 Created: 2011-06-23 Last updated: 2011-08-12Bibliographically approved
2. Models in Neutrino Physics: Numerical and Statistical Studies
Open this publication in new window or tab >>Models in Neutrino Physics: Numerical and Statistical Studies
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The standard model of particle physics can excellently describe the vast majorityof data of particle physics experiments. However, in its simplest form, it cannot account for the fact that the neutrinos are massive particles and lepton flavorsmixed, as required by the observation of neutrino oscillations. Hence, the standardmodel must be extended in order to account for these observations, opening up thepossibility to explore new and interesting physical phenomena.

There are numerous models proposed to accommodate massive neutrinos. Thesimplest of these are able to describe the observations using only a small numberof effective parameters. Furthermore, neutrinos are the only known existing particleswhich have the potential of being their own antiparticles, a possibility that isactively being investigated through experiments on neutrinoless double beta decay.In this thesis, we analyse these simple models using Bayesian inference and constraintsfrom neutrino-related experiments, and we also investigate the potential offuture experiments on neutrinoless double beta decay to probe other kinds of newphysics.

In addition, more elaborate theoretical models of neutrino masses have beenproposed, with the seesaw models being a particularly popular group of models inwhich new heavy particles generate neutrino masses. We study low-scale seesawmodels, in particular the resulting energy-scale dependence of the neutrino parameters,which incorporate new particles with masses within the reach of current andfuture experiments, such as the LHC.

Abstract [sv]

Standardmodellen för partikelfysik beskriver den stora majoriteten data från partikelfysikexperimentutmärkt. Den kan emellertid inte i sin enklaste form beskrivadet faktum att neutriner är massiva partiklar och leptonsmakerna är blandande,vilket krävs enligt observationerna av neutrinooscillationer. Därför måste standardmodellenutökas för att ta hänsyn till detta, vilket öppnar upp möjligheten att utforska nya och intressanta fysikaliska fenomen.

Det finns många föreslagna modeller för massiva neutriner. De enklaste av dessakan beskriva observationerna med endast ett fåtal effektiva parametrar. Dessutom är neutriner de enda kända befintliga partiklar som har potentialen att vara sinaegna antipartiklar, en möjlighet som aktivt undersöks genom experiment på neutrinolöst dubbelt betasönderfall. I denna avhandling analyserar vi dessa enkla modellermed Bayesisk inferens och begränsningar från neutrinorelaterade experiment och undersöker även potentialen för framtida experiment på neutrinolöst dubbelt betasönderfall att bergänsa andra typer av ny fysik.

Även mer avancerade teoretiska modeller för neutrinomassor har föreslagits, med seesawmodeller som en särskilt populär grupp av modeller där nya tunga partiklargenererar neutrinomassor. Vi studerar seesawmodeller vid låga energier, i synnerhetneutrinoparametrarnas resulterande energiberoende, vilka inkluderar nya partiklarmed massor inom räckh°all för nuvarande och framtida experiment såsom LHC.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. xii, 96 p.
Series
Trita-FYS, ISSN 0280-316X ; 2013:50
Keyword
Neutrino mass, lepton mixing, Majorana neutrinos, neutrino oscillations, neutrinoless double beta decay, statistical methods, Bayesian inference, model selection, effective field theory, Weinberg operator, seesaw models, inverse seesaw, right-handed neutrinos, renormalization group, threshold effects., Neutrinomassor, leptonblandning, Majorananeutriner, neutrinooscillationer, neutrinol¨ost dubbelt betas¨onderfall, statistiska metoder, Bayesisk inferens, modellval, effektiv f¨altteori, Weinbergoperator, seesawmodeller, invers seesaw, högerhänta neutriner, renormeringsgrupp, tröskeleffekter.
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-127409 (URN)978-91-7501-854-6 (ISBN)
Public defence
2013-09-13, FB54, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130830

Available from: 2013-08-30 Created: 2013-08-29 Last updated: 2013-08-30Bibliographically approved

Open Access in DiVA

fulltext(703 kB)68 downloads
File information
File name FULLTEXT02.pdfFile size 703 kBChecksum SHA-512
92307bf8cb963251db573fde487cf7a0f235bf05a71bd2799d27f075f0e96be5df87f5256d6cc545691c0d50dadb22e57efaaa2054c96b50163ee140310301b4
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopusPhysical Review Dhttp://arxiv.org/abs/1004.4628

Authority records BETA

Ohlsson, Tommy

Search in DiVA

By author/editor
Bergström, JohannesMalinský, MichalOhlsson, TommyZhang, He
By organisation
Theoretical Particle Physics
Subatomic Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 70 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 104 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