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We work out the phenomenology of untagged time-dependent analysis with radiative D^0-decays into CP eigenstates, which allows to probe the photon polarization by means of the charm mesons' finite width difference. We show that D^0 →ϕγ or D^0 →K̅^0 *γ 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 andoi:10.1140/epjc/s10052-018-5682-7 fatcat:nv5yzi36lbg2xdoanjazyqtpqe