Decaying sterile neutrinos and the short baseline oscillation anomalies

Dentler, Mona; Esteban, Ivan; Kopp, Joachim; Machado, Pedro A. N.

doi:10.1103/physrevd.101.115013

Cited by 69 publications

(69 citation statements)

References 73 publications

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“…It has motivated a worldwide program to search for new particle states with mass-squared differences between 0.1 and 10 eV 2 [6]. Notable other explanations include, for example, phenomenology that modifies the vacuum oscillation probability relevant to short-baseline neutrino experiments , modifications of neutrino propagation in matter [31][32][33][34][35], or production of new particles in the beam or in the detector and its surroundings [36][37][38][39][40][41][42][43][44][45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

“…The 3 þ 1 model is widely used as a benchmark for experimental datasets to examine whether they show evidence for a sterile neutrino. Extensions to this model have been proposed such as adding more neutrino mass states [53], allowing the heavier mass states to decay [27,48,49,54], or introducing secret neutrino interactions [32,[35][36][37]40,[44][45][46][47][55][56][57][58]; these more complex models are not considered further in this work.…”

Section: Introductionmentioning

confidence: 99%

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Searching for eV-scale sterile neutrinos with eight years of atmospheric neutrinos at the IceCube Neutrino Telescope

Aartsen¹,

Abbasi²,

Ackermann³

et al. 2020

Phys. Rev. D

103

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We report in detail on searches for eV-scale sterile neutrinos, in the context of a 3 þ 1 model, using eight years of data from the IceCube Neutrino Telescope. By analyzing the reconstructed energies and zenith angles of 305,735 atmospheric ν μ andν μ events we construct confidence intervals in two analysis spaces: sin 2 ð2θ 24 Þ vs Δm 2 41 under the conservative assumption θ 34 ¼ 0; and sin 2 ð2θ 24 Þ vs sin 2 ð2θ 34 Þ given sufficiently large Δm 2 41 that fast oscillation features are unresolvable. Detailed discussions of the event selection, systematic uncertainties, and fitting procedures are presented. No strong evidence for sterile neutrinos is found, and the best-fit likelihood is consistent with the no sterile neutrino hypothesis with a p value of 8% in the first analysis space and 19% in the second.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Searching for eV-scale sterile neutrinos with eight years of atmospheric neutrinos at the IceCube Neutrino Telescope

Aartsen¹,

Abbasi²,

Ackermann³

et al. 2020

Phys. Rev. D

103

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show abstract

“…Other manifestations of the sterile-neutrino decay hypothesis have been, very recently, discussed in the literature, including [51][52][53]. The work presented here share several similarities with these efforts but we explore, for the most part, a different region of thevery large -space of decaying-sterile-neutrino models.…”

Section: Sensitivity To Non-zero Neutrino Decay Effect On Sbnmentioning

confidence: 77%

On the decaying-sterile-neutrino solution to the electron (anti)neutrino appearance anomalies

Gouvêa

Peres

Prakash

et al. 2020

J. High Energ. Phys.

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We explore the hypothesis that the unexplained data from Liquid Scintillator Neutrino Detector (LSND) and MiniBooNE experiments are evidence for a new, heavy neutrino mass-eigenstate that mixes with the muon-type neutrino and decays into an electron-type neutrino and a new, very light scalar particle. We consider two different decay scenarios, one with Majorana neutrinos, one with Dirac neutrinos; both fit the data equally well. We find a reasonable, albeit not excellent, fit to the data of MiniBooNE and LSND. The decaying-sterile-neutrino hypothesis, however, cleanly evades constraints from disappearance searches and precision measurements of leptonic meson decays, as long as 1 MeV m 4 10 keV. The Short-Baseline Neutrino Program (SBN) at Fermilab should be able to definitively test the decaying-sterile-neutrino hypothesis.

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“…Only points for which tr m m † ∈ [0.01, 1] v 2 are kept. 9 The horizontal green band highlights the range of sin 2 2ϑ (4) µe preferred by the global fit of ref. [88] and cited at the beginning of this section.…”

Section: Jhep07(2020)164mentioning

confidence: 99%

Type-I seesaw with eV-scale neutrinos

Branco

Penedo

Pereira

et al. 2020

J. High Energ. Phys.

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We consider seesaw type-I models including at least one (mostly-)sterile neutrino with mass at the eV scale. Three distinct situations are found, where the presence of light extra neutrinos is naturally justified by an approximately conserved lepton number symmetry. To analyse these scenarios consistently, it is crucial to employ an exact parametrisation of the full mixing matrix. We provide additional exact results, including generalised versions of the seesaw relation and of the Casas-Ibarra parametrisation, valid for every scale of seesaw. We find that the existence of a light sterile neutrino imposes an upper bound on the lightest neutrino mass. We further assess the impact of light sterile states on short-and long-baseline neutrino oscillation experiments, emphasise future detection prospects, and address CP Violation in this framework via the analysis of CP asymmetries and construction of weak basis invariants. The proposed models can accommodate enough active-sterile mixing to play a role in the explanation of short-baseline anomalies.

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Decaying sterile neutrinos and the short baseline oscillation anomalies

Cited by 69 publications

References 73 publications

Searching for eV-scale sterile neutrinos with eight years of atmospheric neutrinos at the IceCube Neutrino Telescope

Searching for eV-scale sterile neutrinos with eight years of atmospheric neutrinos at the IceCube Neutrino Telescope

On the decaying-sterile-neutrino solution to the electron (anti)neutrino appearance anomalies

Type-I seesaw with eV-scale neutrinos

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