We present recent results from the CLEO Collaboration on leptonic decay rates of $D$ and $D_s$ near $c\bar{c}$ production threshold. From these decay rates, we extract the decay constants, f_D = (222.6+-16.7^{+2.8}_{-3.4}) MeV, f_Ds = (274+-10+-5) MeV, and the ratio f_Ds/f_D = 1.23+-0.11+-0.03.

The CBAR (channel modeling based on bi-directional ray tracing and radiative transfer method) software predicts bit error rate and link availability of air-to-ground and ground-to-air communications links. For example, CBAR incorporates the impacts of the terrain, aircraft position orientation and velocity, antenna pattern of aircraft and ground stations, receiver characteristics, and modulation schemes.


Cbar Rates


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