Sterile neutrinos in astrophysical neutrino flavor

Argüelles, C.; Farrag, Kareem Ramadan; Katori, T.; Khandelwal, Rishabh; Mandalia, Shivesh; Salvadó, Jordi

doi:10.1088/1475-7516/2020/02/015

Cited by 32 publications

(35 citation statements)

References 72 publications

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“…The initial energy distribution of the astrophysical neutrino flux should not be affected by the presence of a sterile neutrino, but the normalization of each flavor component is affected; see Refs. [203,204] for a detailed discussion. Thus, in this analysis, the energy spectrum of astrophysical neutrinos is defined by the added ν μ and antineutrino components normalizations, Φ astro , at 100 TeV and the change in the astrophysical spectral index, Δγ astro , relative to a central value of γ astro ¼ −2.5, namely…”

Section: E Astrophysical Neutrino Fluxmentioning

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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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: E Astrophysical Neutrino Fluxmentioning

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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“…• In general, sterile neutrinos in the mass ranges relevant for category a) above impact supernovae neutrino spectra [88,89] and high energy astrophysical neutrino emission in substantial ways [90][91][92].…”

Section: The Lee and Its Resolution Via New Physics: A Post-microboon...mentioning

confidence: 99%

Requirements on common solutions to the LSND and MiniBooNE excesses: a post-MicroBooNE study

Abdallah,

Gandhi,

Roy

2022

Preprint

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The strong statistical significance of an observed electron-like event excess in the MiniBooNE (MB) experiment, along with an earlier similar excess seen in the Liquid Scintillator Neutrino Detector (LSND), when interpreted in conjunction with recent MicroBooNE results may have brought us to the cusp of new physics discoveries. This has led to many attempts to understand these observations, both for each experiment individually and in conjunction, via physics beyond the Standard Model (SM). We provide an overview of the current situation, and discuss three major categories under which the many proposals for new physics fall. The possibility that the same new, non-oscillation physics explains both anomalies leads to new restrictions and requirements. An important class of such common solutions, which we focus on in this work, consists of a heavy O(MeV−sub-GeV) sterile neutral fermion produced in the detectors, (via up-scattering of the incoming muon neutrinos), and subsequently decaying to photons or e + e − pairs which mimic the observed signals. Such solutions are subject to strong demands from a) cross section requirements which would yield a sufficient number of total events in both LSND and MB, b) requirements imposed by the measured energy and angular distributions in both experiments and finally, c) consistency and compatibility of the new physics model and its particle content with other bounds from a diverse swathe of particle physics experiments. We find that these criteria often pull proposed solutions in different directions, and stringently limit the viable set of proposals which could resolve both anomalies. Our conclusions are relevant for both the general search for new physics and for the ongoing observations and analyses of the MicroBooNE experiment.

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“…Given the present energy resolution of astrophysical neutrinos and the expected ratio of baseline to energy, neutrino oscillations will be averaged out. In this regime, the expected flavor composition of astrophysical neutrinos in the presence of a light sterile neutrino can be computed using the following equation [74]…”

Section: Signals In the Astrophysical Neutrino Flavormentioning

confidence: 99%

“…Ref. [74] studied the effect of light sterile neutrinos in an LSND-MiniBooNE-agnostic scenario. In this analysis, the light sterile neutrino mixing parameters were allowed to vary within constraints on the unitarity of the PMNS matrix reported in [83].…”

Section: Signals In the Astrophysical Neutrino Flavormentioning

confidence: 99%

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Sterile Neutrinos with Neutrino Telescopes

Argüelles

Salvadó

2021

Universe

Self Cite

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Searches for light sterile neutrinos are motivated by the unexpected observation of an electron neutrino appearance in short-baseline experiments, such as the Liquid Scintillator Neutrino Detector (LSND) and the Mini Booster Neutrino Experiment (MiniBooNE). In light of these unexpected results, a campaign using natural and anthropogenic sources to find the light (mass-squared-difference around 1 eV2) sterile neutrinos is underway. Among the natural sources, atmospheric neutrinos provide a unique gateway to search for sterile neutrinos due to the broad range of baseline-to-energy ratios, L/E, and the presence of significant matter effects. Since the atmospheric neutrino flux rapidly falls with energy, studying its highest energy component requires gigaton-scale neutrino detectors. These detectors—often known as neutrino telescopes since they are designed to observe tiny astrophysical neutrino fluxes—have been used to perform searches for light sterile neutrinos, and researchers have found no significant signal to date. This brief review summarizes the current status of searches for light sterile neutrinos with neutrino telescopes deployed in solid and liquid water.

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Sterile neutrinos in astrophysical neutrino flavor

Cited by 32 publications

References 72 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

Requirements on common solutions to the LSND and MiniBooNE excesses: a post-MicroBooNE study

Sterile Neutrinos with Neutrino Telescopes

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