Speaker
Nils Hermansson Truedsson
Description
In this talk I will give an overview of the phenomenology of neutron beta decays and the associated Standard Model precision tests in terms of the neutron axial charge $g_A$ and light-quark CKM element $V_{ud}$. Increased precision in current and planned experiments calls for improved theoretical predictions carefully taking into account the non-perturbative effects from QCD. With a precision goal at the sub-percent level also radiative corrections are needed. These can be determined with lattice QCD, effective field theory and dispersion theory. Here I will briefly review what is currently known, and what still needs to be calculated for future precision tests from neutron beta decays.