Improved measurement of absolute branching fraction of Ds+→τ+ν τ
We have studied the leptonic decay Ds+→τ+ντ, via the decay channel τ+→e+νeν̄τ, using a sample of tagged Ds+ decays collected near the Ds*±Ds peak production energy in e+e- collisions with the CLEO-c detector. We obtain B(Ds+→τ+ντ)=( 5.30±0.47±0.22)% and determine the decay constant fDs=(252.5±11.1±...
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Médium: | Journal article |
Jazyk: | English |
Vydáno: |
2009
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