Neutrinoless double-β decay with three or four neutrino mixing

Giunti, C.

doi:10.1103/physrevd.61.036002

Cited by 22 publications

(9 citation statements)

References 104 publications

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“…Therefore, strong cancellations between the contributions of 2 and 3 are possible (albeit not likely [53]), whereas the range in Eq. (35) disfavors strong cancellations between the contributions of 2 and 3 and the contribution of 4 .…”

Section: Predictions For Beta-decay and Neutrinoless Double-beta-mentioning

confidence: 93%

Short-baseline electron neutrino disappearance, tritium beta decay, and neutrinoless double-beta decay

Giunti

Laveder

2010

Phys. Rev. D

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We consider the interpretation of the MiniBooNE low-energy anomaly and the gallium radioactive source experiments anomaly in terms of short-baseline electron neutrino disappearance in the framework of 3 + 1 four-neutrino mixing schemes. The separate fits of MiniBooNE and gallium data are highly compatible, with close best-fit values of the effective oscillation parameters Delta m(2) and sin(2)upsilon. The combined fit gives Delta m(2) greater than or similar to 0.1 eV(2) and 0.11 less than or similar to sin(2)2 upsilon less than or similar to 0.48 at 2 sigma. We consider also the data of the Bugey and Chooz reactor antineutrino oscillation experiments and the limits on the effective electron antineutrino mass in beta decay obtained in the Mainz and Troitsk tritium experiments. The fit of the data of these experiments limits the value of sin(2)2 upsilon below 0.10 at 2 sigma. Considering the tension between the neutrino MiniBooNE and gallium data and the antineutrino reactor and tritium data as a statistical fluctuation, we perform a combined fit which gives Delta m(2) similar or equal to 2 eV and 0.01 less than or similar to sin(2)2 upsilon less than or similar to 0.13 at 2 sigma. Assuming a hierarchy of masses m1, m2, m3 << m4, the predicted contributions of m4 to the effective neutrino masses in beta decay and neutrinoless double-beta decay are, respectively, between about 0.06 and 0.49 and between about 0.003 and 0.07 eV at 2 sigma. We also consider the possibility of reconciling the tension between the neutrino MiniBooNE and gallium data and the antineutrino reactor and tritium data with different mixings in the neutrino and antineutrino sectors. We find a 2.6 sigma indication of a mixing angle asymmetry

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Section: Predictions For Beta-decay and Neutrinoless Double-beta-mentioning

confidence: 93%

Short-baseline electron neutrino disappearance, tritium beta decay, and neutrinoless double-beta decay

Giunti

Laveder

2010

Phys. Rev. D

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“…For values of this parameter larger than ∆m atm , we get two different realizations of the degenerate case. In the following, it will vary between 10 −7 eV and 1eV: going below this range requires huge right-handed masses, typically above GUT or even Planck scale; going above does not help to increase the asymmetry, and generally violates neutrino-less double beta decay experiments [34,35] (see however [36] for a study of possible cancellations using Majorana phases).…”

Section: Parameterisation and Experimental Inputsmentioning

confidence: 99%

Neutrino oscillations v.s. leptogenesis in SO(10) models

Nezri

Orloff

2003

J. High Energy Phys.

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Abstract:We study the link between neutrino oscillations and leptogenesis in the minimal framework assuming an SO(10) see-saw mechanism with 3 families. Dirac neutrino masses being fixed, the solar and atmospheric data then generically induce a large mass-hierarchy and a small mixing between the lightest right-handed neutrinos, which fails to produce sufficient lepton asymmetry by 5 orders of magnitudes at least. This failure can be attenuated for a very specific value of the mixing sin 2 2θ e3 = 0.1, which interestingly lies at the boundary of the CHOOZ exclusion region, but will be accessible to future long baseline experiments.

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“…It links the mass eigenstates ν 1,2,3,4,5 having masses m 1,2,3,4,5 with the three active flavor states ν e,µ,τ and the two new sterile states ν s 1 and ν s 2 . In what follows we denote the mostly active neutrinos with ν 1,2,3 .…”

Section: Neutrino Mixingmentioning

confidence: 99%

“…Here α 2,3,4,5 are the four possible and unknown 4 Majorana phases (we can choose α 1 = 0). Applying nuclear matrix element uncertainties on the current 90% C.L.…”

Section: Neutrino Massesmentioning

confidence: 99%

“…Such schemes were motivated by the results from the LSND experiment [2], which observed flavor transitions interpreted asν µ ↔ν e neutrino oscillations. A number of authors [3,4,5,6,7] investigated the implications of such schemes. In particular, it was realized [8] that socalled 2+2 scenarios (two pairs of neutrinos close in mass separated by a large gap) are ruled out and that only 3+1 scenarios (three mostly active neutrinos separated by a large gap from the mostly sterile one) are allowed, though only small part of the parameter space survived.…”

Section: Introductionmentioning

confidence: 99%

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MiniBooNE results and neutrino schemes with 2 sterile neutrinos: possible mass orderings and observables related to neutrino masses

Goswami¹,

Rodejohann²

2007

J. High Energy Phys.

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The MiniBooNE and LSND experiments are compatible with each other when two sterile neutrinos are added to the three active ones. In this case there are eight possible mass orderings. In two of them both sterile neutrinos are heavier than the three active ones. In the next two scenarios both sterile neutrinos are lighter than the three active ones. The remaining four scenarios have one sterile neutrino heavier and another lighter than the three active ones. We analyze all scenarios with respect to their predictions for mass-related observables. These are the sum of neutrino masses as constrained by cosmological observations, the kinematic mass parameter as measurable in the KATRIN experiment, and the effective mass governing neutrinoless double beta decay. It is investigated how these non-oscillation probes can distinguish between the eight scenarios. Six of the eight possible mass orderings predict positive signals in the KATRIN and future neutrinoless double beta decay experiments. We also remark on scenarios with three sterile neutrinos. In addition we make some comments on the possibility of using decays of high energy astrophysical neutrinos to discriminate between the mass orderings in presence of two sterile neutrinos. *

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Neutrinoless double-β decay with three or four neutrino mixing

Cited by 22 publications

References 104 publications

Short-baseline electron neutrino disappearance, tritium beta decay, and neutrinoless double-beta decay

Short-baseline electron neutrino disappearance, tritium beta decay, and neutrinoless double-beta decay

Neutrino oscillations v.s. leptogenesis in SO(10) models

MiniBooNE results and neutrino schemes with 2 sterile neutrinos: possible mass orderings and observables related to neutrino masses

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