Measurement of the form-factor ratios for D_s^+ -> phi ell^+ nu_ell
High Energy Physics - Experiment
2008-11-26 v1
Abstract
We have measured the form factor ratios r_V = V(0)/A_1(0) and r_2 = A_2(0)/A_1(0) for the decay D_s^+ -> phi ell^+ nu_ell, phi -> 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 r_V = 2.27 +- 0.35 +- 0.22 and r_2 = 1.57 +- 0.25 +- 0.19.
Cite
@article{arxiv.hep-ex/9812013,
title = {Measurement of the form-factor ratios for D_s^+ -> phi ell^+ nu_ell},
author = {Fermilab E791 Collaboration and E. M. Aitala and S. Amato},
journal= {arXiv preprint arXiv:hep-ex/9812013},
year = {2008}
}
Comments
12 pages, 5 postscript figures