Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complete Helicity Decomposition of the B-t-tbar Vertex including Higher
  Order QCD Corrections and Applications to e+e- --> t tbar   The complete density matrix for all polarization configurations in the
process B--> t tbar, where B is an off--shell Z or photon and t is the top
quark, is calculated numerically including oneloop QCD corrections, i.e.
virtual and real gluon contributions in O(alphas). The analysis is done in the
framework of the helicity formalism. The results are particularly suited for
top quark production at the Linear Collider, but may be useful in other
circumstances as well. Relations to LEP and Tevatron physics are pointed out.

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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: nlin