Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure Functions and Distributions in Semileptonic Tau Decays   Semileptonic decays of polarized $\tau$ leptons are investigated. The most
general angular distribution of three meson final states ($\tau\rightarrow
\pi\pi\nu,\,K\pi\nu,\, \pi\pi\pi\nu,\\ \,K\pi\pi\nu,\, KK\pi\nu,\, KKK\nu,\,
\eta\pi\pi\nu,\,\ldots{}$) is discussed. It is shown, that the most general
distribution can be characterized by 16 structure functions, most of which can
be determined in currently ongoing high statistics experiments. Emphasis is put
on $\tau$ decays in $e^{+}e^{-}$ experiments where the neutrino escapes
detection and the $\tau$ rest frame cannot be reconstructed. The structure of
the hadronic matrix elements, based on CVC and chiral lagrangians, is
discussed.

12
The categories of this paper are: nucl-th
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The categories of this paper are: physics
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat