Münster 2017 – scientific programme
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T: Fachverband Teilchenphysik
T 19: Flavourphysik (Theorie)
T 19.9: Talk
Monday, March 27, 2017, 18:45–19:00, VSH 06
Rare radiative D-decays in QCD factorization — Thorsten Feldmann, •Bastian Müller, and Dirk Seidel — Uni Siegen
The idea of the QCD factorization approach (QCDF) is to disentangle short- and long-distance dynamics in exclusive heavy-quark decays. The short-distance processes can be calculated in perturbation theory, the long-distance effects are contained in universal hadronic matrix elements that can be addressed by means of non-perturbative methods. QCDF involves a simultaneous expansion in the strong coupling constant αs and in the ratio ΛQCD / Mh, where ΛQCD is the typical QCD scale and Mh the mass of a heavy hadron. In the past, QCDF has been successfully applied to charmless B-meson decays, including rare radiative decays into a light vector or pseudoscalar mesons at large recoil energy, like B → K(*)ℓ+ℓ− or B→ K*γ. However, it has been queried whether QCDF would result in a reasonable description of the analogous D-meson decays, since the expansion might not converge and non-factorizable long-distance effects might be dominant. In order to shed more light on this issue, the project presented in this talk addresses rare radiative D-meson decays, D→ ργ and D→ ρ (π) ℓ+ℓ− in the framework of QCDF in order to carefully assess the hadronic uncertainties related to spectator-scattering and annihilation topologies.