Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NNLO QCD Corrections to $\gamma + \eta_c(\eta_b)$ Exclusive Production
  in Electron-Positron Collision   Based on the NRQCD factorization formalism, we calculate the
next-to-next-to-leading order QCD corrections to the heavy quarkonium $\eta_c
(\eta_b)$ production associated with a photon at electron-positron colliders.
By matching the amplitudes calculated in full QCD theory to a series of
operators in NRQCD, the short-distance coefficients up to NNLO QCD radiative
corrections are determined. It turns out that the full set of master integrals
that we obtained could be analytically expressed in terms of Goncharov
Polylogarithms, Chen's iterated integrals, and elliptic functions, which mostly
do not exist in the literature and could be employed in the analyses of other
physical processes. In phenomenology, numerical calculations of NNLO K-factors
and cross sections of $e^+e^-\rightarrow \gamma + \eta_c(\eta_b)$ processes in
BESIII and B-factory experiments are performed, which may stand as a test of
the NRQCD higher order calculation while confronting to the data.

10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
2
The categories of this paper are: math
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph