Update of short-baseline electron neutrino and antineutrino disappearance

Abstract. The theory and phenomenology of light sterile neutrinos at the eV mass scale is reviewed. The reactor, Gallium and LSND anomalies are briefly described and interpreted as indications of the existence of short-baseline oscillations which require the existence of light sterile neutrinos. The global fits of short-baseline oscillation data in 3+1 and 3+2 schemes are discussed, together with the implications for β-decay and neutrinoless double-β decay. The cosmological effects of light sterile neutrinos are briefly reviewed and the implications of existing cosmological data are discussed. The review concludes with a summary of future perspectives.

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“…It has been analyzed by several authors [12,27,97,[100][101][102][103][104][105][106][107][108][109][110][111].…”

Section: The Reactor Antineutrino Anomalymentioning

confidence: 99%

Light sterile neutrinos

Gariazzo

Giunti

Laveder

et al. 2015

J. Phys. G: Nucl. Part. Phys.

229

336

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“…The existence of light sterile neutrinos has been considered in recent years as a plausible possibility motivated by the measurements of anomalies which can be explained by short-baseline (SBL) neutrino oscillations generated by a squared-mass difference of the order of 1 eV 2 : the reactor anomaly [25,78,79], the Gallium anomaly [24,27] and the LSND anomaly [80]. Here we consider the results of the analysis of SBL data in the framework of 3+1 mixing presented in Ref.…”

Section: Sbl Priormentioning

confidence: 99%

“…In this paper we consider the possiblity that the dark radiation is made of the light sterile neutrinos (see [20][21][22][23]) whose existence is indicated by recent results of short-baseline (SBL) neutrino oscillation experiments [24][25][26][27][28][29][30]. In particular, we consider the simplest possibility of a 3+1 scheme, in which the three active flavor neutrinos ν e , ν µ , ν τ , are mainly composed of three very light neutrinos ν 1 , ν 2 , ν 3 , with masses much smaller than 1 eV and there is a sterile neutrino ν s which is mainly composed of a new massive neutrino ν 4 with mass m 4 ∼ 1 eV.…”

Section: Introductionmentioning

confidence: 99%

Light sterile neutrinos in cosmology and short-baseline oscillation experiments

Gariazzo

Giunti

Laveder

2013

J. High Energ. Phys.

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We analyze the most recent cosmological data, including Planck, taking into account the possible existence of a sterile neutrino with a mass at the eV scale indicated by short-baseline neutrino oscillations data in the 3+1 framework. We show that the contribution of local measurements of the Hubble constant induces an increase of the value of the effective number of relativistic degrees of freedom above the Standard Model value, giving an indication in favor of the existence of sterile neutrinos and their contribution to dark radiation. Furthermore, the measurements of the local galaxy cluster mass distribution favor the existence of sterile neutrinos with eV-scale masses, in agreement with short-baseline neutrino oscillations data. In this case there is no tension between cosmological and short-baseline neutrino oscillations data, but the contribution of the sterile neutrino to the effective number of relativistic degrees of freedom is likely to be smaller than one. Considering the Dodelson-Widrow and thermal models for the statistical cosmological distribution of sterile neutrinos, we found that in the Dodelson-Widrow model there is a slightly better compatibility between cosmological and short-baseline neutrino oscillations data and the required suppression of the production of sterile neutrinos in the early Universe is slightly smaller.

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“…The ν e andν e disappearance data described in Ref. [42], which take into account the reactor [43] and Gallium [44] anomalies.…”

Section: Sbl Analysismentioning

confidence: 99%

Sterile neutrinos: Cosmology versus short-baseline experiments

et al. 2013

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Cosmology and short baseline neutrino oscillation data both hint at the existence of light sterile neutrinos with masses in the 1 eV range. Here we perform a detailed analysis of the sterile neutrino scenario using both cosmological and SBL data. We have additionally considered the possibility that the extra neutrino degrees of freedom are not fully thermalised in the early universe. Even when analyzing only cosmological data we find a preference for the existence of massive sterile neutrinos in both (3+1) and (3+2) scenarios, and with the inclusion of SBL data the evidence is formally at the 3.3σ level in the case of a (3+1) model. Interestingly, cosmological and SBL data both point to the same mass scale of approximately 1 eV. In the (3+1) framework WMAP9+SPT provide a value of the sterile mass eigenstate m4 = (1.72 ± 0.65) eV: this result is strenghtened by adding the prior from SBL posterior to m4 = (1.27 ± 0.12) eV (m4 = (1.23 ± 0.13) eV when SDSS is also considered in the cosmological analysis). In the (3+2) scheme, two additional, non-fully thermalized, neutrinos are compatible with the whole set of cosmological and SBL data, leading to mass values of m4 = (0.95 ± 0.30) eV and m5 = (1.59 ± 0.49) eV. The inclusion of Planck data does not change our considerations about the mass scale; concerning the extra neutrino degrees of freedom, invoking a partial thermalisation the 3+1 model is still consistent with the latest data.

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Update of short-baseline electron neutrino and antineutrino disappearance

Cited by 176 publications

References 143 publications

Light sterile neutrinos

Light sterile neutrinos

Light sterile neutrinos in cosmology and short-baseline oscillation experiments

Sterile neutrinos: Cosmology versus short-baseline experiments

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