Measurement of Ds+ to mu+ nu and the Decay constant f_Ds

Details Measurement of Ds+ to mu+ nu and the Decay constant f_Ds Measurement of Ds+ to mu+ nu and the Decay constant f_Ds

2006-07-26

arxiv.org/abs/hep-ex/0607074v1

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages postscript,also available through http://www.lepp.cornell.edu/public/CONF/2006, Contributed to ICHEP06

Scientific paper

We examine e+e- to Ds- Ds*+ or Ds-* Ds+ collisions at 4170 MeV using the CLEO-c detector in order to measure the decay constant f_Ds+. We use the Ds+ to ell+ nu channel, where the ell+ designates either a mu+ or a tau+. Analyzing both modes simultaneously, we determine B(D_s^+ to mu+ nu)= (0.657 +- 0.090 +- 0.028)%, B(D_s^+ to tau+ nu)= (7.1 +- 1.4 +- 0.3)%, and extract f_Ds+ = 282 +- 16 +- 7 MeV. Combining with our previous determination of B(D+ to mu+ nu), we find that the ratio f_Ds+/f_D+ = 1.27 +- 0.12 +- 0.03. (All new results here are preliminary.) We compare with current theoretical estimates.

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