The rare decays of D mesons

Abstract The flavor changing transitions in the c → uγ, c →uγγ and c → ul+l− offer the possibility to search for new physics in the charm sector. We investigate dominant decay mechanisms in the radiative decays D → Vγ, D → P(V)l+l−, D → γγ and we discuss chances to see physics beyond the standard model in these decays. In addition, we analyze Cabibbo allowed D → Kπγ decays with nonresonant Kπ, and we probe the role of light vector mesons in these decays.