Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A novel determination of non-perturbative contributions to Bjorken sum
  rule   In the present paper, we first give a detailed study on the pQCD corrections
to the leading-twist part of BSR. Previous pQCD corrections to the
leading-twist part derived under conventional scale-setting approach up to
${\cal O}(\alpha_s^4)$-level still show strong renormalization scale
dependence. The principle of maximum conformality (PMC) provides a systematic
way to eliminate conventional renormalization scale-setting ambiguity by
determining the accurate $\alpha_s$-running behavior of the process with the
help of renormalization group equation. Our calculation confirms the PMC
prediction satisfies the standard renormalization group invariance, e.g. its
fixed-order prediction does scheme-and-scale independent. In low $Q^2$-region,
the effective momentum of the process is small and to have a reliable
prediction, we adopt four low-energy $\alpha_s$ models to do the analysis. Our
predictions show that even though the high-twist terms are generally power
suppressed in high $Q^2$-region, they shall have sizable contributions in low
and intermediate $Q^2$ domain. By using the more accurate scheme-and-scale
independent pQCD prediction, we present a novel fit of the non-perturbative
high-twist contributions by comparing with the JLab data.

6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph