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arXiv · 1802.02769

The photon polarization in radiative $D$ decays, phenomenologically

Stefan de Boer·Gudrun Hiller
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Abstract

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 $D^0 \to ϕγ$ or $D^0 \to \bar K^{0 *} γ$ 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 an up-down asymmetry in $D^0 \to \bar K_1^0 (\to \bar K ππ) γ$. We explore the sensitivity to new physics in $|Δc|=|Δu|=1$ dipole couplings in the decays $D^0 \to ρ^0 γ$. We point out the possibility to test the SM with $D_s \to K_1^+( \to K ππ) γ$ decays.

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Stefan de Boer, Gudrun Hiller. 2018-02-08. The photon polarization in radiative $D$ decays, phenomenologically. https://doi.org/10.1140/epjc%2Fs10052-018-5682-7

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