Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Colour connections of four quark $Q\bar{Q}Q'\bar{Q}'$ system and doubly
  heavy baryon production in $e^{+}e^{-}$ annihilation   The hadronization effects induced by various colour connections of the four
quark system in $e^{+}e^{-}$ annihilation are briefly reviewed. A special
colour connection of four heavy quark system without colour-separation favours
the production of doubly heavy baryons. For the related three-jet case, the
corresponding hadronization has not been considered. We argue that it can be
effectively described as two string fragmentation besides the leading heavy
diquark fragmentation. The production rate and the properties of final state
hadron systems are discussed. Emphasis is on the string effect as a finger
print of this hadronization procedure.

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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
34
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: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex