Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collinear factorization of diphoton photoproduction at next to leading
  order   We calculate in the framework of collinear factorization the amplitude for
the photoproduction of a near forward large mass diphoton at leading twist and
next to leading order (NLO) in $\alpha_s$. We demonstrate the validity of
factorization at this order, which was never achieved for such a reaction where
the coefficient function describes a $2 \to 3$ hard process. While the Born
order amplitude was purely imaginary and only probed the $x=\pm \xi$ cross-over
line of generalized parton distributions (GPD) domain, the NLO result contains
both a real and an imaginary part and probes the whole domain of definition of
quark GPDs. The phenomenology of our results for medium (JLab) and higher
energy (EIC) experiments will be developed in a future study.

27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int