Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Renormalization group improvement of truncated perturbative series in
  QCD. Decays of tau-lepton and eta_c-charmonium   We formulate a general scheme to improve the truncated perturbative expansion
in alpha_s by means of the renormalization group in QCD for the single-scale
quantities. The procedure is used for the evaluation of hadronic decay rates of
tau-lepton and eta_c-charmonium. The scale dependence of result for eta_c is
studied in the scheme of fixed value for the MS-bar mass of charmed quark.

22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
34
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
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat