The exponentiation of soft photon radiation is a classic result of QED, but for QED effects of objects with structure a more general approach is required. In this seminar I discuss how modern methods of effective field theory and factorization (more familiar for the strong interaction) result in a systematic treatment of QED effects in decays of B mesons to a lepton pair, or a pair of light mesons, including the summation of large logarithms.
On top of adding precision, QED offers surprises: for B -> mu mu, the QED correction is enhanced in heavy-quark power counting, and reveals that the process is no longer a pure annihilation decay.
The link will be provided via email by Simon Plätzer (simon.plaetzer@univie.ac.at)
