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A decoherence explanation of the gallium neutrino anomaly

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arxiv 2306.09422 v1 pith:VQVQ373C submitted 2023-06-15 hep-ph hep-ex

Yasaman Farzan , Thomas Schwetz This is my paper · ORCID
classification hep-phhep-ex
keywords neutrinosdecoherenceexplanationgalliumneutrinoquantumactiveanomaly
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abstract

Gallium radioactive source experiments have reported a neutrino-induced event rate about 20\% lower than expected with a high statistical significance. We present an explanation of this observation assuming quantum decoherence of the neutrinos in the gallium detectors at a scale of 2~m. This explanation is consistent with global data on neutrino oscillations, including solar neutrinos, if decoherence effects decrease quickly with energy, for instance with a power law $E_\nu^{-r}$ with $r\simeq 12$. Our proposal does not require the presence of sterile neutrinos but implies a modification of the standard quantum mechanical evolution equations for active neutrinos.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A possible solution to the gallium anomaly moving beyond the leptonic wave function factorization

    hep-ph 2025-12 conditional novelty 6.0 of 10

    A non-factorized amplitude treatment with a fitted sign-changing nuclear transition density reduces the predicted νe-71Ga capture rate by ~20%, absorbing the gallium anomaly without new physics.

  2. Generalized Lindblad master equation for neutrino evolution

    hep-ph 2024-11 conditional novelty 6.0 of 10

    Derives a generalized Lindblad master equation for neutrino evolution with momentum-changing decay and absorption of massless particles, and translates a reactor decoherence bound into a neutrino lifetime limit.

  3. Solar Model Independent Constraints on the Sterile Neutrino Interpretation of the Gallium Anomaly

    hep-ph 2024-11 accept novelty 6.0 of 10

    A global analysis of solar and KamLAND neutrino data finds that the sterile-neutrino explanation of the gallium anomaly remains disfavored at about 3 sigma or higher under all reasonable modeling assumptions.

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