Radiative Corrections to Nuclear Beta Decay

Electromagnetic radiative corrections to pionic beta decay π + → π0e + νe ∗

Nuclear-Structure Dependent Corrections to Superallowed Beta Decay

The first term, δ R’, is a function of the positron’s energy and the charge of the daughter nucleus, Z, and therefore depends on the particular nuclear decay, but it is independent of nuclear structure. It can be calculated from standard QED. Somewhat smaller but nuclearstructure dependent is the correction . NS δ In the last progress report [4] we reported on a re-examination of the two nuclea...

Quenching of Spin Operators in the Calculation of Radiative Corrections for Nuclear Beta Decay

Calculations of the axial-vector component to the radiative correction for superallowed Fermi 0 → 0 nuclear beta decay are here modified with quenched rather than free-nucleon coupling constants for the axial-vector and electromagnetic interactions with nucleons. The result increases the deduced value of Vud but does not restore unitarity in the CKM matrix. Superallowed Fermi 0 → 0 nuclear beta...

Radiative Corrections to Muon and Neutron Decay

The corrections to muon decay due to electromagnetic interactions have been recalculated. Our results differ from those of Behrends, Finkelstein, and Sirlin, because those authors used an inconsistent method for handling the infrared divergences which arise separately in the real and virtual processes. The disagreement is especially significant near the end of the electron (positron) spectrum w...

Full One-Loop Radiative Corrections to the Asymmetry Parameter of Polarised Neutron Beta Decay

We present a calculation of full one-loop radiative corrections, including the constant term, to the asymmetry parameter of polarised neutron beta decay. This gives the radiative correction to the axial coupling constant gA extracted from the beta asymmetry so that it ties to gA that appears in neutron decay lifetime in a consistent renormalisation scheme. We find that the ratio of axial-vector...