Measurement of the form-factor ratios for D_s^+ -> phi ell^+ nu_ell

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.

arXiv comment12 pages, 5 postscript figures

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• Comment on $V_{ub}$ from Exclusive Semileptonic B and D Decays
• Measurement of the form-factor ratios for D^+ -> \overline K^{*0}e^+ν_e
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Cited by in corpus (6)

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• Study of the decay Ds+ --> K+ K- e+ nu
• Form Factors and semileptonic decay of $D_s^{+}\to \varphi \bar{\ell }\nu$ from QCD sum rule
• $\omega$-$\varphi$ mixing and weak annihilation in $D_s$ decays
• Analysis of the semileptonic decay $D^0\to {\bar{K}}^0{\pi }^{-}{\mu }^{+}\nu$
• New Measurements of the Ds to Phi mu nu Form Factor Ratios