Searches for 25 rare and forbidden decays of $D^{+}$ and $D_s^{+}$ mesons

LHCb collaboration, R. Aaij, C. Abellán Beteta +998

A search is performed for rare and forbidden charm decays of the form $D_{(s)}^{+}\to h^{\pm }{\ell }^{+}{\ell }^{(\prime )\mp }$, where $h^{\pm }$ is a pion or kaon and ${\ell }^{{(}^{\prime })\pm }$ is an ele…