Dortmund 2021 – wissenschaftliches Programm
T 6.9: Vortrag
Montag, 15. März 2021, 18:00–18:15, Tf
Radiative three-body D-meson decays in and beyond the standard model — •Nico Adolph1, Joachim Brod2, and Gudrun Hiller1 — 1Technische Universität Dortmund, Dortmund, Deutschland — 2University of Cincinnati, Cincinnati, USA
We study radiative charm decays D → P1 P2 γ, P1,2=π,K in QCD factorization at leading order and within heavy hadron chiral perturbation theory. Branching ratios including resonance contributions are around ∼ 10−3 for the Cabibbo-favored modes into K π γ and ∼ 10−5 for the singly Cabibbo-suppressed modes into π+ π− γ, K+ K− γ, and thus in reach of the flavor factories BES III and Belle II. Dalitz plots and forward-backward asymmetries reveal significant differences between the two QCD frameworks; such observables are therefore ideally suited for a data-driven identification of relevant decay mechanisms in the standard-model dominated D → K π γ decays. This increases the potential to probe new physics with the D → π+ π− γ and D → K+ K− γ decays, which are sensitive to enhanced dipole operators. CP asymmetries are useful to test the SM and look for new physics in neutral |Δ C|=1 transitions.