Measurement of the Absolute Branching Fraction of D_s^+ --> tau^+ nu_tau Decay

Details Measurement of the Absolute Branching Fraction of D_s^+ --> tau^+ nu_tau Decay Measurement of the Absolute Branching Fraction of D_s^+ --> tau^+ nu_tau Decay

2007-12-07

arxiv.org/abs/0712.1175v2

Phys.Rev.Lett.100:161801,2008

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, postscript also available through http://www.lns.cornell.edu/public/CLNS/2007/, revised

Scientific paper

10.1103/PhysRevLett.100.161801

Using a sample of tagged D_s decays collected near the D^*_s D_s peak production energy in e+e- collisions with the CLEO-c detector, we study the leptonic decay D^+_s to tau^+ nu_tau via the decay channel tau^+ to e^+ nu_e bar{nu}_tau. We measure B(D^+_s to tau^+ nu_tau) = (6.17 +- 0.71 +- 0.34) %, where the first error is statistical and the second systematic. Combining this result with our measurements of D^+_s to mu^+ nu_mu and D^+_s to tau^+ nu_tau (via tau^+ to pi^+ bar{nu}_tau), we determine f_{D_s} = (274 +- 10 +- 5) MeV.

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