The photon polarization in radiative D decays, phenomenologically

• Main Authors: Stefan de Boer, Gudrun Hiller
• Format: Article
• Language: English
• Published: SpringerOpen 2018-03-01
• Series: European Physical Journal C: Particles and Fields
• Online Access: http://link.springer.com/article/10.1140/epjc/s10052-018-5682-7

Abstract We work out the phenomenology of untagged time-dependent analysis with radiative $$D^0$$ D0 -decays into CP eigenstates, which allows to probe the photon polarization by means of the charm mesons’ finite width difference. We show that $$D^0 \rightarrow \phi \gamma $$ D0→ϕγ or $$D^0 \rightarrow \bar{K}^{0 *} \gamma $$ D0→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 $$D^0 \rightarrow \bar{K}_1^0 (\rightarrow \bar{K} \pi \pi ) \gamma $$ D0→K¯10(→K¯ππ)γ . We explore the sensitivity to new physics in $$|\Delta c|=|\Delta u|=1$$ |Δc|=|Δu|=1 dipole couplings in the decays $$D^0 \rightarrow \rho ^0 \gamma $$ D0→ρ0γ . We point out the possibility to test the SM with $$D_s \rightarrow K_1^+( \rightarrow K \pi \pi ) \gamma $$ Ds→K1+(→Kππ)γ decays.