Leptonic D and Ds Decays near c-cbar Threshold
Abstract
We present recent results from the CLEO Collaboration on leptonic decay rates of D and Ds near cc production threshold. From these decay rates, we extract the decay constants, fD = (222.6+-16.7+2.8-3.4) MeV, fDs = (274+-10+-5) MeV, and the ratio fDs/fD = 1.23+-0.11+-0.03.
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