Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on the tau neutrino mass and mixing from precise
  measurements of tau decay rates   We have derived constraints on the tau neutrino mass and fourth generation
mixing from an analysis of the partial widths of tau lepton decays, in
particular: tau -> e nu nu_tau, tau -> mu nu nu_tau, tau -> pi nu_tau, tau -> K
nu_tau. We present predictions for the tau decay widths, allowing for a
non-zero tau neutrino mass, m(nu_tau), and for mixing with a neutrino of mass
m(nu_L) > M_Z/2, which is parametrised using a Cabibbo-like mixing angle,
theta_L. By comparison of these theoretical predictions with the experimental
measurements, we obtain the following bounds at the 90% confidence level:
m(nu_tau) < 42 MeV and sin^2(theta_L) < 0.014.

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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ