Improved Measurement of Absolute Branching Fraction of Ds to tau nu

Details Improved Measurement of Absolute Branching Fraction of Ds to tau nu Improved Measurement of Absolute Branching Fraction of Ds to tau nu

2009-01-09

arxiv.org/abs/0901.1147v3

Phys.Rev.D79:052002,2009

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, available through http://www.lns.cornell.edu/public/CLNS/

Scientific paper

10.1103/PhysRevD.79.052002

We have studied the leptonic decay D^+_s to tau^+ nu_tau, via the decay channel tau^+ to e^+ nu_e anti-nu_tau, 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 obtain B(D^+_s to tau^+ nu_tau) = (5.30 +- 0.47 +- 0.22) % and determine the decay constant f_Ds = (252.5 +- 11.1 +- 5.2) MeV, where the first uncertainties are statistical and the second are systematic.

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