Measurement of the Absolute Branching Fraction of Ds+→τ+ντ Decay
Abstract
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 study the leptonic decay Ds+→τ+ντ via the decay channel τ+→e+νeν¯τ. We measure B(Ds+→τ+ντ)=(6.17±0.71±0.34)%, where the first error is statistical and the second systematic. Combining this result with our measurements of Ds+→μ+νμ and Ds+→τ+ντ (via τ+→π+ν¯τ), we determine fDs=(274±10±5)MeV.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 2008
- DOI:
- 10.1103/PhysRevLett.100.161801
- arXiv:
- arXiv:0712.1175
- Bibcode:
- 2008PhRvL.100p1801E
- Keywords:
-
- 13.20.Fc;
- Decays of charmed mesons;
- High Energy Physics - Experiment
- E-Print:
- 9 pages, postscript also available through http://www.lns.cornell.edu/public/CLNS/2007/, revised