Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large Mass Expansion versus Small Momentum Expansion of Feynman Diagrams   The method of the large mass expansion (LME) has the technical advantage that
two-loop integrals occur only as bubbles with large masses. In many cases only
one large mass occurs. In such cases these integrals are expressible in terms
of $\Gamma$-functions, i.e. they can be handled completely analytically
avoiding even recursions and therefore this approach may find a wide field of
application. We consider it necessary to investigate the precision of this
method and test it for several two-loop vertex functions ocurring in the $Z \to
b\bar{b}$ decay by comparing it with the small momentum expansion. It turns out
that in general high order approximants have to be taken into account for a
sufficient accuracy.

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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat