Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Irreducible tensor basis and general Fierz relations for Bhabha
  scattering like amplitudes   We construct an irreducible s- and t-channel tensor basis for Bhabha
scattering like amplitudes based on the properties of the underlying Lorentz
symmetry in four space-time dimensions. In the given basis the calculation of
amplitude contractions like the amplitude square reduces to the contraction of
their corresponding coefficient tensors. Further the basis retains the full
amplitude information and thus can be applied in off-shell cases. The general
Fierz transformations which relate the s- and t-channel basis with each other
are obtained. As an example for application we use the basis to calculate the
tree-level Bhabha scattering amplitude.

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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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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: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ