Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of Ds+ to mu+ nu and the Decay constant f_Ds   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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The categories of this paper are: atom-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat
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The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga