S Fajfer (Univ. of Ljubljana and Inst. J. Stefan)
Rare D decays might serve as a test of FCNC transition in the up-quark sector. The presence of new physics in these decays is rather difficult to detect due to the contributions of SM long distance dynamics. Basic features of rare charm meson transitions within the Standard model and beyond are discussed. Chances to observe new physics signals are considered for inclusive c-> u gamma and c -> u l+l- decays and exclusive D ->V gamma, D -> P l+ l-, D-> V l+l- and D -> l+ l- decays.