Measurement of the form-factor ratios for D+ --> K* l nu

Details Measurement of the form-factor ratios for D+ --> K* l nu Measurement of the form-factor ratios for D+ --> K* l nu

1998-09-24

arxiv.org/abs/hep-ex/9809026v1

Phys.Lett.B440:435-441,1998

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages + 3 figures ; submitted to PLB

Scientific paper

10.1016/S0370-2693(98)01243-X

The form factor ratios rv=V(0)/A1(0), r2=A2(0)/A1(0) and r3=A3(0)/A1(0) in the decay D+ --> K* l nu, K* -->K-pi+ have been measured using data from charm hadroproduction experiment E791 at Fermilab. From 3034 (595) signal (background) events in the muon channel, we obtain rv=1.84+-0.11+-0.09, r2=0.75+-0.08+-0.09 and, as a first measurement of r3, we find 0.04+-0.33 +-0.29. The values of the form factor ratios rv and r2 measured for the muon channel are combined with the values of rv and r2 that we have measured in the electron channel. The combined E791 results for the muon and electron channels are rv=1.87+-0.08+-0.07 and r2=0.73+-0.06+-0.08.

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