Speaker
Alexey Petrov
(Wayne State University)
Description
We propose a novel method to study flavor-changing neutral currents in the $e^+ e^− \to D^{∗0}$ and $e^+ e^− \to B^∗_s$ transitions, tuning the energy of $e^+e^−$- collisions to the mass of the narrow vector resonance $D^{∗0}$ or $B^∗_s$. We present a thorough study of both short-distance and long-distance contributions to $e^+e^− \to D^{∗0}$ in the Standard Model and investigate possible contributions of new physics in the charm sector. This process, albeit very rare, has clear advantages with respect to the $D^0 \to e^+ e^−$ decay: the helicity suppression is absent, and a richer set of effective operators can be probed. Implications of the same proposal for $B^∗_s$ are also discussed.
Author
Alexey Petrov
(Wayne State University)
Co-authors
Alexander Khodjamirian
(University of Siegen)
Thomas Mannel
(Siegen University)
