We measure the decay constant fDs+ using the Ds+→+ν channel, where the + designates either a μ+ or a τ+, when the τ+→π+ν ̄. Using both measurements we find fDs+=274±13±7MeV. Combining with our previous determination of fD+, we compute the ratio fDs+/fD+=1.23±0.11±0.04. We compare with theoretical estimates.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)