Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors

Schoppmann, S.

doi:10.3390/universe7100360

Cited by 6 publications

(6 citation statements)

References 60 publications

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“…Most of the neutrino oscillation experimental results agree well with the three massive neutrinos mixing model, however, there are some experimental anomalies as observed by Gallium experiments [74][75][76], LSND [77,78], MiniBoone [79][80][81] and the reactor anomalies [82,83]. The results from these experiments call for the existence of light sterile neutrinos [84][85][86].…”

Section: Jhep01(2023)052mentioning

confidence: 57%

Extra dimensions with light and heavy neutral leptons: an application to CEνNS

Khan

2023

J. High Energ. Phys.

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We explore the possibility of relating extra dimensions with light and heavy Dirac-type neutral leptons and develop a framework for testing them in various laboratory experiments. The Kaluza-Klein modes in the large extra dimension models of the light neutral leptons could mix with the standard model neutrinos and produce observable effects in the oscillation experiments. We show that the chirality flipping up-scattering processes occurring through either neutrino magnetic dipole moment or the weakly coupled scalar interactions can also produce heavy Kaluza-Klein modes of the corresponding right-handed neutral leptons propagating in one or more extra dimensions. However, to conserve the four- dimensional energy-momentum, their masses must be below the maximum energy of the neutrinos in the initial state. The appreciable size of extra dimensions connected with these heavy neutral leptons can thus affect the cross-sections of these processes. This framework applies to any up-scattering process. Our work here focuses only on its application to the coherent elastic neutrino-nucleus scattering process. We derive constraints on the size of extra dimensions using the COHERENT data in oscillation and up-scattering processes. For model with one large extra dimension for the light neutral leptons, we obtain the limits, R ~ 3 μm (NH) and R ~ 2.5 μm (IH), on the size of extra dimension corresponding to the absolute mass limit, m0 ≤ 3 × 10−3 eV at 90% C.L. from the short-baseline oscillations. Using the up-scattering process for heavy neutral leptons, we obtain new parameter spaces between the size of extra dimensions and parameters of the dipole or scalar interactions.

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Section: Jhep01(2023)052mentioning

confidence: 57%

Extra dimensions with light and heavy neutral leptons: an application to CEνNS

Khan

2023

J. High Energ. Phys.

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“…The picture regarding their inter-connectedness to LSND and MB, however, remains unclear. Recent reviews and references on active-sterile oscillation solutions to the anomalies may be found in [8,[33][34][35][36][37]. Variants on the simple vacuum oscillation solution, which use matter effects and resonant oscillations with new mediators to produce a single electron or positron in the detector may be found in [38] (vector mediator) and [39] (scalar mediator).…”

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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“…The picture regarding their inter-connectedness to LSND and MB, however, remains unclear. Recent reviews and references on active-sterile oscillation solutions to the anomalies may be found in [8,[34][35][36][37][38]. Variants on the simple vacuum oscillation solution, which use matter effects and resonant oscillations with new mediators to produce a single electron or positron in the detector may be found in [39] (vector mediator) and [40] (scalar mediator).…”

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

Gandhi²,

Roy³

2022

J. High Energ. Phys.

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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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Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors

Cited by 6 publications

References 60 publications

Extra dimensions with light and heavy neutral leptons: an application to CEνNS

Extra dimensions with light and heavy neutral leptons: an application to CEνNS

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

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

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