Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Measurement of the W to tau+nu Production Cross Section in p-pbar
  Collisions at sqrt(s) = 1.8 TeV   We report on a measurement of sigma(p-pbar to W+X) times B(W to tau+nu) in
p-pbar collisions at sqrt(s) = 1.8 TeV at the Fermilab Tevatron. The
measurement is based on an integrated luminosity of 18 pb^-1 of data collected
with the D0 detector during 1994-1995. We find that sigma(p-pbar to W+X) times
B(W to tau+nu) = 2.22 +- 0.09 (stat) +- 0.10 (syst) +- 0.10 (lum) nb. Lepton
universality predicts that the ratio of the tau and electron electroweak
charged current couplings to the W boson, g_tau^W / g_e^W, be unity. We find
g_tau^W / g_e^W = 0.980 +- 0.031, in agreement with lepton universality.

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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: stat