B(Ds+ -> l+ nu) and the Decay Constant f(Ds+)
Abstract
I report final CLEO-c results on the purely leptonic decays of the Ds+ -> l+ nu, for the cases when l+ is a mu+ or tau+, when it decays into pi+ anti-nu, using 314/pb of data at 4.170 GeV. I also include preliminary results from the tau+ -> e+ nu anti-nu channel using 195/pb. Combining both we measure fDs= 275 +/- 10 +/- 5 MeV, and fDs+/fD+=1.24 +/- 0.10 =/- 0.03 .
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