Theory and Phenomenology of Neutrino Oscillations and Masses

Giunti, C.

doi:10.1016/j.nuclphysbps.2007.03.012

Cited by 15 publications

(9 citation statements)

References 37 publications

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“…First of all, such an extension makes neutrinos massive and thus perhaps provides the simplest and the most natural explanation of the phenomenon of "neutrino oscillations" (see e.g. Fogli et al (2006); Strumia & Vissani (2006); Giunti (2007) for reviews). The smallness of neutrino masses in this model (called νMSM in Asaka & Shaposhnikov 2005) is achieved by the usual see-saw mechanism with Majorana masses of right-handed neutrinos being below electroweak scale.…”

Section: Sterile Neutrino Dmmentioning

confidence: 99%

Constraining dark matter properties with SPI

Boyarsky

Malyshev

Neronov

et al. 2008

Monthly Notices of the Royal Astronomical Society

169

268

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Using the high‐resolution spectrometer SPI on board the International Gamma‐Ray Astrophysics Laboratory (INTEGRAL), we search for a spectral line produced by a dark matter (DM) particle with a mass in the range 40 keV < MDM < 14 MeV, decaying in the DM halo of the Milky Way. To distinguish the DM decay line from numerous instrumental lines found in the SPI background spectrum, we study the dependence of the intensity of the line signal on the offset of the SPI pointing from the direction toward the Galactic Centre. After a critical analysis of the uncertainties of the DM density profile in the inner Galaxy, we find that the intensity of the DM decay line should decrease by at least a factor of 3 when the offset from the Galactic Centre increases from 0° to 180°. We find that such a pronounced variation of the line flux across the sky is not observed for any line, detected with a significance higher than 3σ in the SPI background spectrum. Possible DM decay origin is not ruled out only for the unidentified spectral lines, having low (∼3σ) significance or coinciding in position with the instrumental ones. In the energy interval from 20 keV to 7 MeV, we derive restrictions on the DM decay line flux, implied by the (non‐)detection of the DM decay line. For a particular DM candidate, the sterile neutrino of mass MDM, we derive a bound on the mixing angle.

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Section: Sterile Neutrino Dmmentioning

confidence: 99%

Constraining dark matter properties with SPI

Boyarsky

Malyshev

Neronov

et al. 2008

Monthly Notices of the Royal Astronomical Society

169

268

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“…One of the first review article on phenom enology of neutrino oscillations [22] was written soon after the publication of work [4]. The problems in question are briefly discussed in [23,24] and more recently in [25,26]. They are also considered in suffi cient detail in the reviews on various aspects of neu trino physics, such as neutrinoless double beta decay [27].…”

Section: Introductionmentioning

confidence: 99%

Search for the νμ → ντ oscillation with the OPERA hybrid detector

et al. 2013

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This work reviews the status of the international OPERA experiment aimed at searching for the ν μ → ν τ oscillation. Development of the emulsion techniques in the preceding DONUT and CHORUS experi ments is described. A brief overview of the NOMAD experiment is given, in which properties of ν τ interac tions were thoroughly investigated. Characteristics of the CERN-Gran Sasso (CNGS) neutrino beam are given, the structure of the OPERA hybrid detector and the functions of its subsystems are considered, and the automatic emulsion scanning technique is briefly reviewed. Uncertainties in reconstruction of event param eters using the electronic and emulsion detectors are discussed and the procedure adopted in the experiment for identification of ν τ interactions is described. The main sources of background in the search for ν μ → ν τ oscillation are considered. Topologies of the first two ν τ candidates observed in the OPERA emulsion detector are presented. Possibilities of increasing the ν τ interaction selection efficiency using multidimensional criteria are briefly discussed.

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“…Namely, apart from the absence of the DM candidate, the MSM fails to explain observed neutrino oscillations -the transition between neutrinos of different flavors (for a review see e.g. Fogli et al 2006;Strumia & Vissani 2006;Giunti 2007). The explanation of this phenomenon is the existence of neutrino mass.…”

Section: Introductionmentioning

confidence: 99%

Constraints on decaying dark matter fromXMMNewtonobservations of M31

Boyarsky

Iakubovskyi

Ruchayskiy

et al. 2008

Monthly Notices of the Royal Astronomical Society

138

181

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We derive constraints on the parameters of the radiatively decaying dark matter (DM) particle, using the XMM–Newton EPIC spectra of the Andromeda galaxy (M31). Using the observations of the outer (5–13 arcmin) parts of M31, we improve the existing constraints. For the case of sterile neutrino DM, combining our constraints with the latest computation of abundances of sterile neutrinos in the Dodelson–Widrow (DW) scenario, we obtain the lower mass limit ms < 4 keV, which is stronger than the previous one ms < 6 keV, obtained recently by Asaka, Laine & Shaposhnikov. Comparing this limit with the most recent results on Lyman α forest analysis of Viel et al. (ms > 5.6 keV), we argue that the scenario in which all the DM is produced via the DW mechanism is ruled out. We discuss, however, other production mechanisms and note that the sterile neutrino remains a viable candidate for DM, either warm or cold.

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Theory and Phenomenology of Neutrino Oscillations and Masses

Cited by 15 publications

References 37 publications

Constraining dark matter properties with SPI

Constraining dark matter properties with SPI

Search for the νμ → ντ oscillation with the OPERA hybrid detector

Constraints on decaying dark matter fromXMMNewtonobservations of M31

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