Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for infrared finite coupling in Sudakov resummation: a revised
  view-point   I show that Sudakov resummation takes a particularly transparent form if one
deals with the second logarithmic derivative of the short distance coefficient
functions for deep inelastic scattering and the Drell-Yan process. A uniquely
defined Sudakov exponent emerges, and I conjecture that the leftover constant
terms not included in the exponent are given by the second logarithmic
derivative of the massless quark form factor. The meaning of a previously
obtained large $N_f$ evidence for an infrared finite perturbative Sudakov
coupling is reconsidered. This coupling is reinterpreted as a Minkowskian
coupling, making the introduction of a low-energy non-perturbative modification
of the corresponding Euclidean coupling a priori necessary. Some hints for a
Banks-Zaks type of fixed point in the Euclidean coupling at finite $N_f$ are
nevertheless pointed out, and strong evidence is provided in favor of its
universality. A criterion to select in a unique way the proper Euclidean
Sudakov coupling relevant to the issue of power corrections is suggested.

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The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol