Radiative contribution to thermal grating decay

The c → uγ Contribution to Weak Radiative Charm Decay

The c → uγ transition does not occur at the tree level in the Standard Model and is strongly GIM-suppressed at one loop. The leading QCD logarithms are known to enhance the amplitude by two orders of magnitude. We point out that the amplitude increases further by two orders of magnitude after including the complete 2-loop QCD contributions. Nevertheless, ∆S = 0 radiative decays of charmed hadro...

The c - - - ) uy Contribution to Weak Radiative Charm 1 Decay

The c + uy transition does not occur at the tree level in the Standard Model and is . strongly GIM-suppressed at one loop. The leading QCD logarithms are known to enhance the amplitude by two orders of magnitude. We point out that the amplitude increases further by two orders of magnitude after including the complete 2-100~ QCD contributions. Nevertheless, AS = 0 radiative decays of charmed had...

Resumming the color-octet contribution to radiative Υ decay

At the upper endpoint of the photon energy spectrum in Υ → Xγ, the standard NRQCD power counting breaks down and the OPE gives rise to color-octet structure functions. Furthermore, in this kinematic regime large Sudakov logarithms appear in the octet Wilson coefficients. The endpoint spectrum can be treated consistently within the framework of a recently developed effective field theory of coll...

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.