Radiative Correction to -Decay Matrix Element

Superallowed Fermi beta decay: the radiative correction

Precision studies of superallowed beta decay are used to determine the Cabibbo-KobayashiMaskawa (CKM) matrix element Vud and to study the matrix’s unitarity. To reach this goal, however, the experimental β-decay rates need to be corrected for radiative and isospin-symmetry-breaking effects. The radiative correction, which in total is around 4%, is conveniently divided into terms that are nucleu...

Corrections to the Fermi matrix element for superallowed beta decay.

From these Pt values, it is then possible to determine empirical values of 6l . Until recently, the experimental ft values, together with the calculated corrections 6~ and 6'~ for the eight most accurately measured ft values (' 0, Al, CI, K, Sc, V, Mn, Co), failed to yield constant Pt values. In fact, the data gave two Pt values, one consistent for Z & 21, and another for Z ~ 21. This failure t...

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...

Hyperon radiative decay.

Radiative Decay Engineering

Metallic surfaces can have unusual effects on fluorophores such as increasing or decreasing the rates of radiative decay and the rates of resonance energy transfer (RET). In the present article we describe the effects of metallic silver island films on the emission spectra, lifetimes, and energy transfer for several fluorophores. The fluorophores are not covalently coupled to the silver islands...