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Electroweak nuclear radii constrain the isospin breaking correction to $V_{ud}$

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arxiv 2208.03037 v2 pith:ENAQ252L submitted 2022-08-05 nucl-th hep-exhep-phnucl-ex

classification nucl-thhep-exhep-phnucl-ex
keywords nuclearbreakingcorrectiondeltaelectroweakexistingexperimentalradii
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We lay out a novel formalism to connect the isospin-symmetry breaking correction to the rates of superallowed nuclear beta decays, $\delta_\text{C}$, to the isospin-breaking sensitive combinations of electroweak nuclear radii that can be accessed experimentally. We individuate transitions in the superallowed decay chart where a measurement of the neutron skin of a stable daughter even at a moderate precision could already help discriminating between models used to compute $\delta_\text{C}$. We review the existing experimental situation and make connection to the existing and future experimental programs.

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  1. Quantum Monte Carlo calculation of $\delta_{\rm NS}$ in $^{10}$C using an effective field theory approach

    nucl-th 2025-09 conditional novelty 6.0 of 10

    The first quantum Monte Carlo evaluation of the nuclear-structure-dependent radiative correction in carbon-10 confirms the NCSM dispersion result, with the residual uncertainty set by two undetermined low-energy constants.

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