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Matter and damping effects in neutrino mixing and oscillations
KTH, School of Engineering Sciences (SCI), Physics. (Teoretisk partikelfysik)ORCID iD: 0000-0001-5948-9152
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis is devoted to the study of neutrino physics in general and the study of neutrino mixing and oscillations in particular. In the standard model of particle physics, neutrinos are massless, and as a result, they do not mix or oscillate. However, many experimental results now seem to give evidence for neutrino oscillations, and thus, the standard model has to be extended in order to incorporate neutrino masses and mixing among different neutrino flavors.

When neutrinos propagate through matter, the neutrino mixing, and thus, also the neutrino oscillations, may be significantly altered. While the matter effects may be easily studied in a framework with only two neutrino flavors and constant matter density, we know that there exists (at least) three neutrino flavors and that the matter density of the Universe is far from constant. This thesis includes studies of three-flavor effects and a solution to the two-flavor neutrino oscillation problem in matter with an arbitrary density profile.

Furthermore, there have historically been attempts to describe the neutrino flavor transitions by other effects than neutrino oscillations. Even if these effects now seem to be disfavored as the leading mechanism, they may still give small corrections to the neutrino oscillation formulas. These effects may lead to erroneous determination of the fundamental neutrino oscillation parameters and are also studied in this thesis in form of damping factors.

Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , x, 57 p.
Series
Trita-FYS, ISSN 0280-316X ; 2005:21
Keyword [en]
Engineering physics, Neutrino oscillations, neutrino mixing, matter effects, damping effects, the day-night effect, solar neutrinos
Keyword [sv]
Teknisk fysik
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-301ISBN: 91-7178-016-5 (print)OAI: oai:DiVA.org:kth-301DiVA: diva2:8756
Supervisors
Note
QC 20101124Available from: 2005-07-15 Created: 2005-07-15 Last updated: 2011-12-09Bibliographically 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

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Blennow, Mattias

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