Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Instanton--Antiinstanton pair induced Asymptotics of Perturbation Theory
  in QCD   The instanton--antiinstanton pair induced asymptotics of perturbation theory
expansion for QCD correlators is considered. It is argued that though the true
asymptotics is dominated by renormalon, the instanton-induced contribution may
dominate in the intermediate asymptotics $n= 5\div 15$.
  Obtained asymptotic formulae are valid for $N_f \le N_c$. For $N_f =N_c$ the
finite nonperturbative expression for instanton--antiinstanton contribution was
also found.
  At $q^2<0$ the imaginary part of correlators in the case $N_f =N_c$ is
suppressed like $1/\log (q/\Lambda)$, but the present accuracy of instanton
calculations allows to fix it unambiguously.
  The series of corrections to the instanton induced asymptotics of the order
of $\sim (\log(n)/n)^k$ is found.

16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th