We have measured the form factor ratios rV = V(0)/A1(0) and r2 = A2(0)/A1(0) for the decay Ds+ → φℓ+ νℓ, φ → K+ K-, using data from charm hadroproduction experiment E791 at Fermilab. Results are based on 144 signal and 22 background events in the electron channel and 127 signal and 34 background events in the muon channel. We combine the measurements from both lepton channels to obtain rV = 2.27 ± 0.35 ± 0.22 and r2 = 1.57 ± 0.25 ± 0.19.
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 1999|