We report the results of a search for the leptonic decay D+'+ using the Mark III detector at the SLAC e+e- storage ring SPEAR. A data sample of 9.3 pb-1 collected at the (3770) resonance yields no signal events, corresponding to a 90%-confidence-level upper limit of 7.2×10-4 on the branching ratio B(D+'+). This represents an upper limit on the pseudoscalar decay constant fD of 290 MeV/c2.
ASJC Scopus subject areas
- Physics and Astronomy(all)