Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-Loop ${\cal O}(\alpha_s^2)$ Correction to the $H\to b\bar b$ Decay
  Rate Induced by the Top Quark   We present the two-loop QED and QCD corrections to the $f\bar fH$ Yukawa
coupling that are induced by the exchange of a virtual photon or gluon,
respectively, with a heavy-fermion loop inserted. As an application, we study
the corresponding $\O(\alpha_s^2M_H^2/m_t^2)$ correction to the $H\to b\bar b$
decay rate.

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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th