Spurious Isospin Breaking in the In-medium Similarity Renormalization Group
Abstract
Robustly quantifying the uncertainty in the isospin-related theoretical correction δC to superallowed beta decay rates is vital for a correct assessment of CKM unitarity. To this end, we identify the sources of artificial or spurious isospin symmetry breaking introduced by the IMSRG many-body framework at a computational level and provide remedies. We test our best policy for preventing spurious ISB by evaluating δC.
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