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Model-independent determination of nuclear weak form factors and implications for Standard Model precision tests
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Model-independent determination of nuclear weak form factors and implications for Standard Model precision tests
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We analyze the recoil corrections in superallowed beta decays of $T=1$, $J^P=0^+$ nuclei by fixing the mean square charge weak radius model-independently using the data of multiple charge radii across the nuclear isotriplet. By comparing to model estimations, we argue that the existing theory uncertainty in the statistical rate function $f$ might have been substantially underestimated. We discuss the implications of our proposed strategy for precision tests of Standard Model, including a potential alleviation of the first-row CKM unitarity deficit, and motivate new experiments for charge radii measurements.
Forward citations
Cited by 2 Pith papers
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Taming nuclear size and shape effects in superallowed beta-decay
A combined ab initio and experimental analysis of nuclear form factors reduces uncertainties in superallowed beta-decay rates, enabling a more precise first-row CKM unitarity test.
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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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