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T: Fachverband Teilchenphysik

T 19: Flavourphysik (Theorie)

T 19.9: Vortrag

Montag, 27. März 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 α_s and in the ratio Λ_QCD / M_h, where Λ_QCD is the typical QCD scale and M_h 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.