Search for the decay D0-->e+e-

Abstract

We report a search for the decay D0→e+e− based on a data sample of 9.6 pb−1 collected at the ψ(3770) resonance with the Mark III detector at the SLAC e+e− storage ring SPEAR. We find no evidence for this flavor-changing weak-neutral-current decay and set an upper limit on the branching ratio of B(D0→e+e−)<1.3×10−4 at the 90% confidence level. This limit constrains various extensions of the standard model.Received 18 December 1987DOI:https://doi.org/10.1103/PhysRevD.37.2023©1988 American Physical Society