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

Glick-Magid, Ayala; Forssén, Christian; Gazda, Daniel; Gazit, Doron; Gysbers, Peter; Navrátil, Petr

doi:10.1016/j.physletb.2022.137259

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

Ayala Glick-Magid
(
- Hebrew U.
)
,
Christian Forssén
(
- Chalmers U. Tech.
)
,
Daniel Gazda
(
- Rez, Nucl. Phys. Inst.
)
,
Doron Gazit
(
- Hebrew U.
)
,
Peter Gysbers
(
- TRIUMF and
- British Columbia U.
)

Jul 21, 2021

Published in:

Phys.Lett.B 832 (2022) 137259

Published: Sep 10, 2022

e-Print:

2107.10212 [nucl-th]

DOI:

10.1016/j.physletb.2022.137259 (publication)

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Abstract: (Elsevier B.V.)

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 ⁶He 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.

Note:

Published version

correction: recoil
effective field theory: chiral
nucleus: structure function
new physics
sensitivity
impulse approximation
shell model
semileptonic decay

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