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PKU HEP Seminar and Workshop (北京大学高能物理组)

【Heavy Flavor and QCD Forum】Shedding light on exclusive B decays

by Prof. Martin Beneke (Technical University of Munich)



The exponentiation of soft photon radiation is a classic result of QED, but for QED effects on 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 mesons, including the summation of large logarithms.  A generalization of light-cone distribution amplitudes of light and heavy mesons to include electromagnetic interactions is introduced. 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. About the Speaker: Prof. Martin Beneke received his doctorate at the Technical University of Munich on the structure of perturbative series in higher order in 1993 and habilitated in Heidelberg in 1998. At the age of 33 he became head of the Chair of Theoretical Physics (Department E) at the RWTH Aachen University. In 2008 Prof. Martin Beneke was awarded the Leibniz Prize (the most important research award in Germany), on account of his significant contributions to the elementary particle physics. At present he has published 150 original scientific works collecting more than 22000 citations in total (with 12 papers cited more than 500 times and the average citations above 150). In 2012 Prof. Martin Beneke was appointed to the Chair of Theoretical Elementary Particle Physics at the Technical University of Munich. Zoom: 844 0206 3593, pwd: 750403