Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing Quark Fragmentation Functions for Spin-1/2 Baryon Production in
  Unpolarized $e^+e^-$ Annihilation   We study the measurement of the quark fragmentation functions for spin-1/2
baryon production ($\Lambda$ and $\bar \Lambda$, in particular) in unpolarized
$e^+e^-$ annihilation. The spin-dependent fragmentation functions $\hat g_1(z)$
and $\hat h_1(z)$ can be probed in the process as a result of quark-antiquark
spin correlation and the weak decay of the baryons. The relevant cross section
is expressed as a product of the two-jet cross-section, the fragmentation
functions, and the differential width of the hyperon decay.

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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
1
The categories of this paper are: cs
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The categories of this paper are: hep-ex