Thesis defense of Nico Adolph

comprises a study of rare radiative |∆c| = |∆u| = 1 transitions within and beyond the standard model. For the 18 three-body decays D → P1 P2 γ with P = π, K, decay amplitudes are derived using Low’s theorem [...] Ds → K1 (→ Kππ)γ decays is studied with respect to new physics effects in the dipole coefficients. Within the standard model, the polarization parameter agrees with the SM-like partner decay D+ → K1 (→ Kππ)γ [...] partner decays allows to construct a null test which does not require precise knowledge of the hadronic K1 → Kππ decay. Finally, different ways to test the standard model with rare radiative decays of charm …