Production and decay of F+(2030) observed in νμ interactions in emulsion

Abstract An event representing the production and decay of the charmed F + meson has been identified by means of a 3-constraint fit to decay hypothesis F + → π + π + π − π 0 , in which both γ - rays from the π 0 converted. The event was produced by a charged current ν μ interaction in an emulsion stack located inside the Fermilab 15-foot bubble chamber. The F + traveled 50 μm , corresponding to a proper time of 1.4 × 10 −13 seconds, before decaying in flight. Its mass was determined to be 2017 ± 25MeV.