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Matter and damping effects in neutrino mixing and oscillations
KTH, Skolan för teknikvetenskap (SCI), Fysik. (Teoretisk partikelfysik)ORCID-id: 0000-0001-5948-9152
2005 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH , 2005. , s. x, 57
Serie
Trita-FYS, ISSN 0280-316X ; 2005:21
Emneord [en]
Engineering physics, Neutrino oscillations, neutrino mixing, matter effects, damping effects, the day-night effect, solar neutrinos
Emneord [sv]
Teknisk fysik
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-301ISBN: 91-7178-016-5 (tryckt)OAI: oai:DiVA.org:kth-301DiVA, id: diva2:8756
Veileder
Merknad
QC 20101124Tilgjengelig fra: 2005-07-15 Laget: 2005-07-15 Sist oppdatert: 2022-06-23bibliografisk kontrollert
Delarbeid
1. Day-night effect in solar neutrino oscillations with three flavors
Åpne denne publikasjonen i ny fane eller vindu >>Day-night effect in solar neutrino oscillations with three flavors
2004 (engelsk)Inngår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 69, nr 7, s. 073006-1-073006-9Artikkel i tidsskrift (Fagfellevurdert) 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).

sted, utgiver, år, opplag, sider
The American Physical Society, 2004
Emneord
SUPERBEAMS, article, elementary particle, flavor, mathematical analysis, neutrino, night, oscillation, solar energy
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-7244 (URN)10.1103/PhysRevD.69.073006 (DOI)000221253900014 ()2-s2.0-42749106442 (Scopus ID)
Forskningsfinansiär
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577Swedish Research Council, 621-2001-1978
Merknad
QC 20100630Tilgjengelig fra: 2011-06-21 Laget: 2007-05-31 Sist oppdatert: 2022-06-26bibliografisk kontrollert
2. Exact series solution to the two flavor neutrino oscillation problem in matter
Åpne denne publikasjonen i ny fane eller vindu >>Exact series solution to the two flavor neutrino oscillation problem in matter
2004 (engelsk)Inngår i: Journal of Mathematical Physics, ISSN 0022-2488, E-ISSN 1089-7658, Vol. 45, nr 11, s. 4053-4063Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
American Institute of Physics, 2004
Emneord
neutrino oscillations, flavour model, nonlinear differential equations, Earth, convergence of numerical methods
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-7245 (URN)10.1063/1.1793330 (DOI)000224945900005 ()2-s2.0-22544485995 (Scopus ID)
Forskningsfinansiär
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577
Merknad
QC 20100630 QC 20110915Tilgjengelig fra: 2011-06-17 Laget: 2007-05-31 Sist oppdatert: 2022-06-26bibliografisk kontrollert
3. Effective neutrino mixing and oscillations in dense matter
Åpne denne publikasjonen i ny fane eller vindu >>Effective neutrino mixing and oscillations in dense matter
2005 (engelsk)Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 609, nr 3-4, s. 330-338Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier B.V., 2005
Emneord
analytic method; article; calculation; mathematical computing; mathematical model; neutrino; oscillation; probability; validation process
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-7246 (URN)10.1016/j.physletb.2005.01.063 (DOI)000227534200022 ()2-s2.0-14144254930 (Scopus ID)
Forskningsfinansiär
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577
Merknad

QC 20100630

Tilgjengelig fra: 2011-06-17 Laget: 2007-05-31 Sist oppdatert: 2022-06-26bibliografisk kontrollert
4. Damping signatures in future neutrino oscillation experiments
Åpne denne publikasjonen i ny fane eller vindu >>Damping signatures in future neutrino oscillation experiments
2005 (engelsk)Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2005, nr 06, s. 049-Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
IOP Publishing, 2005
Emneord
Solar and atmospheric neutrinos, neutrino physics
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-7247 (URN)10.1088/1126-6708/2005/06/049 (DOI)000230409600036 ()2-s2.0-22144490532 (Scopus ID)
Forskningsfinansiär
Swedish Research Council, 621-2001-1611Swedish Research Council, 621-2002-3577
Merknad

QC 20100630

Tilgjengelig fra: 2011-06-17 Laget: 2007-05-31 Sist oppdatert: 2022-06-26bibliografisk kontrollert

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