Bounds on heavy sterile neutrinos revisited

Kusenko, Alexander; Pascoli, Silvia; Semikoz, D.

doi:10.1088/1126-6708/2005/11/028

Cited by 115 publications

(144 citation statements)

References 40 publications

(148 reference statements)

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“…Upper and lower bounds on the mixing can be obtained from supernova SN1987A data [73], since the known duration of the blast would be modified if the right-handed neutrinos are produced in the core and escape carrying energy away. BBN limits have also been explored for the very low mass region [72,[74][75][76].…”

Section: Minimum Seesaw Scales That Future Experiments Could Probementioning

confidence: 99%

Muon conversion to electron in nuclei in type-I seesaw models

Alonso

Dhen

Gavela

et al. 2013

J. High Energ. Phys.

171

175

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We compute the µ → e conversion in the type-I seesaw model, as a function of the right-handed neutrino mixings and masses. The results are compared with previous computations in the literature. We determine the definite predictions resulting for the ratios between the µ → e conversion rate for a given nucleus and the rate of two other processes which also involve a µ − e flavour transition: µ → eγ and µ → eee. For a quasi-degenerate mass spectrum of right-handed neutrino masses -which is the most natural scenario leading to observable rates-those ratios depend only on the seesaw mass scale, offering a quite interesting testing ground. In the case of sterile neutrinos heavier than the electroweak scale, these ratios vanish typically for a mass scale of order a few TeV. Furthermore, the analysis performed here is also valid down to very light masses. It turns out that planned µ → e conversion experiments would be sensitive to masses as low as 2 MeV. Taking into account other experimental constraints, we show that future µ → e conversion experiments will be fully relevant to detect or constrain sterile neutrino scenarios in the 2 GeV−1000 TeV mass range.

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Section: Minimum Seesaw Scales That Future Experiments Could Probementioning

confidence: 99%

Muon conversion to electron in nuclei in type-I seesaw models

Alonso

Dhen

Gavela

et al. 2013

J. High Energ. Phys.

171

175

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“…We show these excluded regions as well as the limits from n 5 decays in dileptonic K decays [38]. Note that, as pointed out previously [49], the PS191 and CHARM collaborations considered n 5 decays through charge-current channels only. When the necessary neutralcurrent contributions are added [24], the bounds are strengthened somewhat compared to the published results [49].…”

Section: Measured π Meson Branching Fractionmentioning

confidence: 54%

“…Note that, as pointed out previously [49], the PS191 and CHARM collaborations considered n 5 decays through charge-current channels only. When the necessary neutralcurrent contributions are added [24], the bounds are strengthened somewhat compared to the published results [49]. We provide bounds including both the charge-and neutral-current contributions.…”

Section: Measured π Meson Branching Fractionmentioning

confidence: 96%

“…(4). There are several model-independent bounds: [34] (right frame) and SN1987A [35] (both frames), as well as bounds from the NuTeV oscillation search [16] (red dotted, right frame), Rπ [37,38] (left frame), measurements of τµ [38][39][40][41][42] (left frame), collider and line searches [38,[43][44][45][46][47][48][49] (both frames), and searches for µ → eγ [50] (both frames). The left panel shows lines of constant values of r from 1.05 to 2.4 (for the calculation of r, we assume no CP violation and take |Ue4Uµ4| = 0.023, as explained in the text).…”

Section: E Combined Bounds On N5mentioning

confidence: 99%

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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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“…Each of these two possibilities offers a viable scenario for leptogenesis, in which the lepton asymmetry is generated by either the sterile neutrino decays [5], or by neutrino oscillations [6]. The current experimental constraints allow both possibilities [7].…”

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confidence: 99%

Sterile dark matter and reionization

Kusenko

2007

Nuclear Physics B - Proceedings Supplements

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Sterile neutrinos with masses in the keV range can be the dark matter, and their emission from a supernova can explain the observed velocities of pulsars. The sterile neutrino decays could produce the x-ray radiation in the early universe, which could have an important effect on the formation of the first stars. X-rays could ionize gas and could catalyze the production of molecular hydrogen during the "dark ages". The increased fraction of molecular hydrogen could facilitate the cooling and collapse of the primordial gas clouds in which the first stars were formed.

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Bounds on heavy sterile neutrinos revisited

Cited by 115 publications

References 40 publications

Muon conversion to electron in nuclei in type-I seesaw models

Muon conversion to electron in nuclei in type-I seesaw models

Neutrino phenomenology in a3+1+1framework

Sterile dark matter and reionization

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