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Theoretical and Phenomenological Studies of Neutrino Physics
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0001-5948-9152
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis is devoted to the theory and phenomenology of neutrino physics. While the standard model of particle physics has been extremely successful, it fails to account for massive neutrinos, which are necessary to describe the observations of neutrino oscillations made by several different experiments. Thus, neutrino physics is a possible window for exploring the physics beyond the standard model, making it both interesting and important for our fundamental understanding of Nature.

Throughout this thesis, we will discuss different aspects of neutrino physics, ranging from taking all three types of neutrinos into account in neutrino oscillation experiments to exploring the possibilities of neutrino mass models to produce a viable source of the baryon asymmetry of the Universe. The emphasis of the thesis is on neutrino oscillations which, given their implication of neutrino masses, is a phenomenon where other results that are not describable in the standard model could be found, such as new interactions between neutrinos and fermions.

Place, publisher, year, edition, pages
Stockholm: Teoretisk fysik , 2007. , xii, 102, [7] p.
Series
Trita-FYS, ISSN 0280-316X ; 2007:31
Keyword [en]
neutrino mass, neutrino mixing, neutrino oscillations, matter effects, non-standard effects, the day-night effect, solar neutrinos, accelerator neutrinos, exact solutions, three-flavor effects, large density, neutrino decay, neutrino decoherence, neutrino absorption, non-standard neutrino interactions, seesaw mechanism, stability criteria, leptogenesis
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-4415ISBN: 978-91-7178-646-3 (print)OAI: oai:DiVA.org:kth-4415DiVA: diva2:12206
Public defence
2007-06-11, Oskar Kleins auditorium (FR4), Huvudbyggnaden, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100630Available from: 2007-05-31 Created: 2007-05-31 Last updated: 2010-06-30Bibliographically approved
List of papers
1. Day-night effect in solar neutrino oscillations with three flavors
Open this publication in new window or tab >>Day-night effect in solar neutrino oscillations with three flavors
2004 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 69, no 7, 073006-1-073006-9 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the effects of a nonzero leptonic mixing angle theta(13) on the solar neutrino day-night asymmetry. Using a constant matter density profile for the Earth and well-motivated approximations, we derive analytical expressions for the nu(e) survival probabilities for solar neutrinos arriving directly at the detector and for solar neutrinos which have passed through the Earth. Furthermore, we numerically study the effects of a nonzero theta(13) on the day-night asymmetry at detectors and find that they are small. Finally, we show that if the uncertainties in the parameters theta(12) and Deltam(2) as well as the uncertainty in the day-night asymmetry itself were much smaller than they are today, this effect could, in principle, be used to determine theta(13).

Place, publisher, year, edition, pages
The American Physical Society, 2004
Keyword
SUPERBEAMS, article, elementary particle, flavor, mathematical analysis, neutrino, night, oscillation, solar energy
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7244 (URN)10.1103/PhysRevD.69.073006 (DOI)000221253900014 ()2-s2.0-42749106442 (Scopus ID)
Funder
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577Swedish Research Council, 621-2001-1978
Note
QC 20100630Available from: 2011-06-21 Created: 2007-05-31 Last updated: 2017-12-14Bibliographically approved
2. Exact series solution to the two flavor neutrino oscillation problem in matter
Open this publication in new window or tab >>Exact series solution to the two flavor neutrino oscillation problem in matter
2004 (English)In: Journal of Mathematical Physics, ISSN 0022-2488, E-ISSN 1089-7658, Vol. 45, no 11, 4053-4063 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, we present a real nonlinear differential equation for the two flavor neutrino oscillation problem in matter with an arbitrary density profile. We also present an exact series solution to this nonlinear differential equation. In addition, we investigate numerically the convergence of this solution for different matter density profiles such as constant and linear profiles as well as the Preliminary Reference Earth Model describing the Earth's matter density profile. Finally, we discuss other methods used for solving the neutrino flavor evolution problem.

Place, publisher, year, edition, pages
American Institute of Physics, 2004
Keyword
neutrino oscillations, flavour model, nonlinear differential equations, Earth, convergence of numerical methods
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7245 (URN)10.1063/1.1793330 (DOI)000224945900005 ()2-s2.0-22544485995 (Scopus ID)
Funder
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577
Note
QC 20100630 QC 20110915Available from: 2011-06-17 Created: 2007-05-31 Last updated: 2017-12-14Bibliographically approved
3. Effective neutrino mixing and oscillations in dense matter
Open this publication in new window or tab >>Effective neutrino mixing and oscillations in dense matter
2005 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 609, no 3-4, 330-338 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the effective case of two-flavor neutrino oscillations in infinitely dense matter by using a perturbative approach. We begin by briefly summarizing the conditions for the three-flavor neutrino oscillation probabilities to take on the same form as the corresponding two-flavor probabilities. Then, we proceed with the infinitely dense matter calculations. Finally, we study the validity of the approximation of infinitely dense matter when the effective matter potential is large, but not infinite, this is done by using both analytic and numeric methods.

Place, publisher, year, edition, pages
Elsevier B.V., 2005
Keyword
analytic method; article; calculation; mathematical computing; mathematical model; neutrino; oscillation; probability; validation process
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7246 (URN)10.1016/j.physletb.2005.01.063 (DOI)000227534200022 ()2-s2.0-14144254930 (Scopus ID)
Funder
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577
Note

QC 20100630

Available from: 2011-06-17 Created: 2007-05-31 Last updated: 2017-12-14Bibliographically approved
4. Damping signatures in future neutrino oscillation experiments
Open this publication in new window or tab >>Damping signatures in future neutrino oscillation experiments
2005 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2005, no 06, 049- p.Article in journal (Refereed) Published
Abstract [en]

We discuss the phenomenology of damping signatures in the neutrino oscillation probabilities, where either the oscillating terms or the probabilities can be damped. This approach is a possibility for tests of damping effects in future neutrino oscillation experiments, where we mainly focus on reactor and long-baseline experiments. We extensively motivate different damping signatures due to small corrections by neutrino decoherence, neutrino decay, oscillations into sterile neutrinos, or other mechanisms, and classify these signatures according to their energy ( spectral) dependencies. We demonstrate, at the example of short baseline reactor experiments, that damping can severely alter the interpretation of results, e. g., it could fake a value of sin(2)(2 theta(13)) smaller than the one provided by Nature. In addition, we demonstrate how a neutrino factory could constrain different damping models with emphasis on how these different models could be distinguished, i.e., how easily the actual type of effect could be identified. We find that the damping models cluster in different categories, which can be much better distinguished from each other than models within the same cluster.

Place, publisher, year, edition, pages
IOP Publishing, 2005
Keyword
Solar and atmospheric neutrinos, neutrino physics
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7247 (URN)10.1088/1126-6708/2005/06/049 (DOI)000230409600036 ()2-s2.0-22144490532 (Scopus ID)
Funder
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577
Note

QC 20100630

Available from: 2011-06-17 Created: 2007-05-31 Last updated: 2017-12-14Bibliographically approved
5. Non-standard Hamiltonian effects on neutrino oscillations
Open this publication in new window or tab >>Non-standard Hamiltonian effects on neutrino oscillations
2007 (English)In: The European Physical Journal C, ISSN 1434-6044, Vol. 49, no 4, 1023-1039 p.Article in journal (Refereed) Published
Abstract [en]

We investigate non-standard Hamiltonian effects on neutrino oscillations, which are effective additional contributions to the vacuum or matter Hamiltonian. Since these effects can enter in either the flavor or mass basis, we develop an understanding of the difference between these bases representing the underlying theoretical model. In particular, the simplest of these effects are classified as "pure" flavor or mass effects, where the appearance of such a "pure" effect can be quite plausible as a leading non-standard contribution from theoretical models. Compared to earlier studies investigating particular effects, we aim for a top-down classification of a possible "new physics" signature at future long-baseline neutrino oscillation precision experiments. We develop a general framework for such effects with two neutrino flavors and discuss the extension to three neutrino flavors, and we demonstrate the challenges for a neutrino factory to distinguish the theoretical origin of these effects with a numerical example as well. We find how the precision measurements of neutrino oscillation parameters can be altered by non-standard effects alone (not including non-standard interactions in the creation and detection processes) and that the non-standard effects on Hamiltonian level can be distinguished from other non-standard effects (such as neutrino decoherence and decay) if we consider the specific imprint of the effects on the energy spectra of several different oscillation channels at a neutrino factory.

Place, publisher, year, edition, pages
Springer-Verlag / Società Italiana di Fisica, 2007
Keyword
Mass Varying Neutrinos, Matter, Spectroscopy, Golden
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7248 (URN)10.1140/epjc/s10052-006-0177-3 (DOI)000244692500011 ()2-s2.0-33847628889 (Scopus ID)
Funder
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577Swedish Research Council, 621- 2005-3588
Note
QC 20100630Available from: 2011-06-17 Created: 2007-05-31 Last updated: 2011-06-17Bibliographically approved
6. Effects of non-standard interactions in the MINOS experiment
Open this publication in new window or tab >>Effects of non-standard interactions in the MINOS experiment
2008 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 660, no 5, 522-528 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the effects of non-standard interactions on the determination of the neutrino oscillation parameters Delta m(31)(2), theta(23), and theta(13) in the MINOS experiment. We show that adding non-standard interactions to the analysis lead to an extension of the allowed parameter space to larger values of Delta m(31)(2) and smaller theta(23), and basically removes all predictability for theta(13). In addition, we discuss the sensitivities to the non-standard interaction parameters of the MINOS experiment alone. In particular, we examine the degeneracy between theta(13) and the non-standard interaction parameter epsilon(e tau). We find that this degeneracy is responsible for the removal of the theta(13) predictability and that the possible bound on vertical bar epsilon(e tau)vertical bar is competitive with direct bounds only if a more stringent external bound on theta(13) is applied.

Place, publisher, year, edition, pages
Elsevier B.V., 2008
Keyword
Neutrino oscillation experiments, line-experiment-simulator, matter, spectroscopy, physics
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-7249 (URN)10.1016/j.physletb.2008.01.049 (DOI)000254034000014 ()2-s2.0-39149110271 (Scopus ID)
Funder
Swedish Research Council, 621-2005-3588
Note
QC 20100630Available from: 2011-06-17 Created: 2007-05-31 Last updated: 2017-12-14Bibliographically approved
7. Stability and leptogenesis in the left-right symmetric seesaw mechanism
Open this publication in new window or tab >>Stability and leptogenesis in the left-right symmetric seesaw mechanism
Show others...
2007 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 4, 022-1-022-25 p.Article in journal (Refereed) Published
Abstract [en]

We analyze the left-right symmetric type I+II seesaw mechanism, where an eight-fold degeneracy among the mass matrices of heavy right-handed neutrinos M-R is known to exist. Using the stability property of the solutions and their ability to lead to successful baryogenesis via leptogenesis as additional criteria, we discriminate among these eight solutions and partially lift their eight-fold degeneracy. In particular, we find that viable leptogenesis is generically possible for four out of the eight solutions.

Keyword
baryogenesis, neutrino physics
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-7250 (URN)10.1088/1126-6708/2007/04/022 (DOI)000246396400022 ()
Note
QC 20100630 QC 20110518Available from: 2011-05-18 Created: 2007-05-31 Last updated: 2017-12-14Bibliographically approved

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