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Gallium Anomaly: Critical View from the Global Picture of $\nu_{e}$ and $\bar\nu_{e}$ Disappearance
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abstract
The significance of the Gallium Anomaly, from the BEST, GALLEX, and SAGE radioactive source experiments, is quantified using different theoretical calculations of the neutrino detection cross section, and its explanation due to neutrino oscillations is compared with the bounds from the analyses of reactor rate and spectral ratio data, $\beta$-decay data, and solar neutrino data. In the 3+1 active-sterile neutrino mixing scheme, the Gallium Anomaly is in strong tension with the individual and combined bounds of these data sets. In the combined scenario with all available data, the parameter goodness of fit is below 0.042%, corresponding to a severe tension of 4-5$\sigma$, or stronger. Therefore, we conclude that one should pursue other possible solutions beyond short-baseline oscillations for the Gallium Anomaly. We also present a new global fit of $\nu_e$ and $\bar\nu_e$ disappearance data, showing that there is a 2.6-3.3$\sigma$ preference in favor of short-baseline oscillations, which is driven by an updated analysis of reactor spectral ratio data.
Forward citations
Cited by 4 Pith papers
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A possible solution to the gallium anomaly moving beyond the leptonic wave function factorization
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.
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LIQUIDating the Gallium Anomaly
A 100-ton indium-loaded opaque scintillator with a 51Cr source could test the full gallium anomaly parameter space at high significance.
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Solar Model Independent Constraints on the Sterile Neutrino Interpretation of the Gallium Anomaly
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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Probing conventional and new physics at the ESS with coherent elastic neutrino-nucleus scattering
Projected ESS CEνNS measurements would improve current constraints on the weak mixing angle, nuclear neutron radii, and several new physics scenarios by large factors, and would lead in some unexplored mass ranges.
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