Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Search for CP Violation in Tau Lepton Decay   Using the CLEO II detector we have performed the first search for $CP$
violation in tau lepton decay. CP violation in lepton decay does not occur in
the minimal standard model but can occur in extensions such as the multi-Higgs
doublet model. It appears as a characteristic difference between the $\tau^+$
and $\tau^-$ decay angular distributions for the semi-leptonic decay modes such
as $\tau^- \to K^0 \pi^- \nu$. We define an observable asymmetry to exploit
this and find no evidence for any CP violation.

35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat