Nuclear ab initio calculations of 6He β-decay for beyond the Standard Model studies

• DOI: 10.1016/j.physletb.2022.137259
• Publication Date: 2022-06-22T12:20:32Z
• Authors: Ayala Glick-Magid; Christian Forssén; Daniel Gazda; Doron Gazit; Peter Gysbers; Petr Navrátil
• Keywords: Nuclear Theory (nucl-th); Nuclear Theory; Physics; QC1-999; 0103 physical sciences; FOS: Physical sciences; Nuclear Experiment (nucl-ex); Nuclear Experiment; 01 natural sciences

Published version<br/>Precision measurements of $β$-decay observables offer the possibility to search for deviations from the Standard Model. A possible discovery of such deviations requires accompanying first-principles calculations. Here we compute the nuclear structure corrections for the $β$-decay of $^6$He which is of central interest in several experimental efforts. We employ the impulse approximation together with wave functions calculated using the ab initio no-core shell model with potentials based on chiral effective field theory. We use these state-of-the-art calculations to give a novel and comprehensive analysis of theoretical uncertainties. We find that nuclear corrections, which we compute within the sensitivity of future experiments, create significant deviation from the naive Gamow-Teller predictions, making their accurate assessment essential in searches for physics beyond the Standard Model.<br/>