Abstract
We propose a novel method to study flavor-changing neutral currents in the e + e − → D ∗0 and e + e − → 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 − → 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 → 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.
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Khodjamirian, A., Mannel, T. & Petrov, A.A. Direct probes of flavor-changing neutral currents in e + e −-collisions. J. High Energ. Phys. 2015, 142 (2015). https://doi.org/10.1007/JHEP11(2015)142
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DOI: https://doi.org/10.1007/JHEP11(2015)142