Measurement of the form-factor ratios for D^+ -> \overline K^{*0}e^+ν_e

Abstract

We present a measurement of the form-factor ratios r_V=V(0)/A_1(0) and r_2=A_2(0)/A_1(0) for the decay D^+ -> \overline K^{*0} e^+ ν_e. The measurement is based on a signal of approximately 3000 $D^{+}->{\overline{K}}^{\ast 0}{e}^{+}{\nu }_e,{\overline{K}}^{\ast 0}->K^{-}{\pi }^{+}$ decays reconstructed in data from charm hadroproduction experiment E791 at Fermilab. The results are r_V = 1.84 +- 0.11 +- 0.08 and r_2 = 0.71 +- 0.08 +- 0.09.

9 pages, 2 figures