Eur. Phys. J. C (2018) 78: 188
https://doi.org/10.1140/epjc/s10052-018-5682-7

Regular Article - Theoretical Physics

The photon polarization in radiative D decays, phenomenologically

¹ Institut für Theoretische Teilchenphysik, Karlsruher Institut für Technologie, 76128, Karlsruhe, Germany
² Fakultät Physik, TU Dortmund, Otto-Hahn-Str.4, 44221, Dortmund, Germany

^* e-mail: ghiller@physik.uni-dortmund.de

Received: 13 February 2018
Accepted: 25 February 2018
Published online: 6 March 2018

Abstract

We work out the phenomenology of untagged time-dependent analysis with radiative -decays into CP eigenstates, which allows to probe the photon polarization by means of the charm mesons’ finite width difference. We show that or decays, which are SM-dominated, or SM-like, respectively, together with U-spin allow to obtain chirality-predictions for radiative decay amplitudes. The order of magnitude of wrong-chirality contributions in the SM can be cross-checked with an up–down asymmetry in . We explore the sensitivity to new physics in dipole couplings in the decays . We point out the possibility to test the SM with decays.