Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massless propagators: applications in QCD and QED   We report on two recent results based on the evaluation of five-loop massless
propagators in QCD and QED: (i) corrections of order $\alpha_s^4$ to the
absorptive part of the polarization function in QCD with $n_f=3$;(ii) the
five-loop contribution to the $\beta$ function of quenched QED.

30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
1
The categories of this paper are: cs