Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD tests in tau decays with optimized perturbation expansion   The next-to-next-to-leading order perturbative QCD corrections to R_tau and
the higher moments of the invariant mass distribution in the hadronic tau
decays are considered. The renormalization scheme dependence of these
corrections is discussed. The optimized predictions are obtained, using the
principle of minimal sensitivity as a guide to select the preferred
renormalization scheme. A simplified fit is performed, using R_tau and
R^12_tau, to see how the use of the optimized expansion may affect the
determination of the alpha_s and the dimension six condensates from the
experimental data.

34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex