Speaker
Description
Neutron beta decay is an excellent case for testing the internal consistency of the Standard Model electroweak sector and probe new physics (NP) at the TeV scale through its absence of nuclear structure corrections. Radiative corrections (RC) precipitate the largest change to the decay rate and have received renewed interest due to recent changes. With the advent of precision lattice QCD calculations, a comparison with experimental form factors are intrinsically interesting for NP given that any differences due to RC are taken into account. Using chiral effective field theory, we report on percent-level unaccounted-for differences between the vector and axial weak charge with sizeable uncertainties. We discuss consequences for extracting NP from the comparison with lattice QCD and point towards successful future strategies.
