Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Test of the Heavy Top Expansion in the Evaluation of MW and
  sin^2theta_eff   In order to test the accuracy of the Heavy Top-mass Expansion (HTE) employed
in recent two-loop calculations of MW and sin^2theta_eff, we consider their
contributions to subtracted quantities of the form MW_sub=MW(mh)-MW(mh0), where
mh0 is a reference point. The results are compared with those obtained by a
precise numerical evaluation of all the two-loop contributions involving both
the Higgs boson and a fermion loop. For the choice mh0=65 GeV, and over the
large range 65 GeV <mh< 1TeV, we find very small differences between the
precise and HTE calculations, amounting to |deltaMW|<0.8 MeV and |delta
s^2_eff|<1.2 x 10^-5. Although corrections involving light fermions are
necessary for the consistency and test of existent calculations, we also
discuss the separate contributions from the top-bottom isodoublet. In this
case, the differences are larger, although still small, namely |deltaMW|<1.9
MeV and |delta s^2_eff|< 4.5 x 10^-5.

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The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
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The categories of this paper are: stat