Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse-momentum resummation and the structure of hard factors at the
  NNLO   In this proceeding we consider QCD radiative corrections to the production of
colourless high-mass systems in hadron collisions. At small transverse momentum
the logarithmically-enhanced contributions can be organized to all perturbative
orders by a universal resummation formula that depends on a single
process-dependent hard factor. We show that the hard factor is directly related
to the all-order virtual amplitude of the corresponding partonic process by a
universal (process independent) formula, which we explicitly evaluate up to
two-loop level. Once the next-to-next-to-leading order (NNLO) scattering
amplitude is available, the corresponding hard factor is directly determined.
It can be used in fully-exclusive perturbative calculations (via q$_T$
subtraction formalism) up to NNLO, in resummed calculations at full
next-to-next-to-leading logarithmic (NNLL) accuracy, and also, it's a necessary
ingredient to the next subsequent logarithmic order (N$^3$LL).

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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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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: gr-qc
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The categories of this paper are: funct-an