Statistical significance of the gallium anomaly

Giunti, C.; Laveder, M.

doi:10.1103/physrevc.83.065504

Cited by 572 publications

(815 citation statements)

References 73 publications

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“…Other than the above motivation, some of the current neutrino oscillation experiments (reactor [24][25][26], accelerator [27][28][29][30] and Gallium [31,32]) suggest the existence of sterile fermions with masses in the eV range. This would imply that instead of the three-neutrino mixing scheme (in oscillation phenomena), one would have a 3 + 1-neutrino (or 3+more) mixing schemes (see, for instance, [33]).…”

Section: Jhep08(2016)079mentioning

confidence: 99%

Electron electric dipole moment in Inverse Seesaw models

Abada

Toma

2016

J. High Energ. Phys.

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Abstract:We consider the contribution of sterile neutrinos to the electric dipole moment of charged leptons in the most minimal realisation of the Inverse Seesaw mechanism, in which the Standard Model is extended by two right-handed neutrinos and two sterile fermion states. Our study shows that the two pairs of (heavy) pseudo-Dirac mass eigenstates can give significant contributions to the electron electric dipole moment, lying close to future experimental sensitivity if their masses are above the electroweak scale. The major contribution comes from two-loop diagrams with pseudo-Dirac neutrino states running in the loops. In our analysis we further discuss the possibility of having a successful leptogenesis in this framework, compatible with a large electron electric dipole moment.

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Section: Jhep08(2016)079mentioning

confidence: 99%

Electron electric dipole moment in Inverse Seesaw models

Abada

Toma

2016

J. High Energ. Phys.

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“…An alternative is 1 sterile state together with nonstandard interactions [28]. Yet another motivation for low-mass sterile neutrinos arises from a combined fit of MiniBooNE and Gallium radioactive source experiments [29].…”

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confidence: 99%

Cosmology seeking friendship with sterile neutrinos

Hamann

Hannestad

Raffelt

et al. 2011

Nuclear Physics B - Proceedings Supplements

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“…The GA has been reported in [26] and also discussed clearly in [17] and [55]: SAGE and Gallex have independently measured a lower-than-expected flux of ν e from the decay of megacurie sources of 51 Cr and 37 Ar, corresponding to anomalously low rates of the reaction ν e + 71 Ga→ 71 Ge + e − . This is in principle bounded by similar measurements of the rate of ν e + 12 C → 12 N g.s.…”

Section: Discussionmentioning

confidence: 99%

Neutrino phenomenology in a3+1+1framework

2012

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Evidence continues to grow in the MiniBooNE (MB) antineutrino mode supporting a low-energy excess compatible with the MB neutrino mode and possibly also confirming the results of the LSND experiment. At least one sterile neutrino is required to explain the anomalies consistent with the observations of other experiments. At the same time, there is a strong tension between the positive signals of LSND and MB and the null results of νe and νµ disappearance experiments. We explore a scenario, first proposed in [1], where the presence of an additional heavy sterile neutrino (with mass well above an eV) can alleviate tension between LSND, MB and the null results of disappearance experiments. We compare and contrast this 3+1+1 scenario with the more standard 3+1 scenario and carry out global fits to all oscillation data including new 2011 MBν data. We find that the tension can be somewhat alleviated and that a phenomenologically viable window for the heavy neutrino, consistent with rare decays and BBN constraints, can be found if the fifth neutrino has a mass of order 0.3 − 10 GeV. We also find, however, that the 2011 MBν data exacerbates the tension with null experiments in both the 3+1 and 3+1+1 models when the lowest energy bins are included, resulting in little improvement in the global fit. We also discuss the implications of an additional neutrino for the reactor and gallium anomalies, and show that an oscillation explanation of the anomalies is disfavored by cosmological considerations, direct searches, and precision electroweak tests.2

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Statistical significance of the gallium anomaly

Cited by 572 publications

References 73 publications

Electron electric dipole moment in Inverse Seesaw models

Electron electric dipole moment in Inverse Seesaw models

Cosmology seeking friendship with sterile neutrinos

Neutrino phenomenology in a3+1+1framework

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