Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inclusive Prompt Photon Production in Hadronic Final States of $e^+e^-$
  Annihilation   We provide complete analytic expressions for the inclusive prompt photon
production cross section in hadronic final states of $e^+e^-$ annihilation
reactions through one-loop order in quantum chromodynamics perturbation theory.
Computed explicitly are direct photon production through first order in the
electromagnetic strength $\alpha_{em}$ and the quark-to-photon and
gluon-to-photon fragmentation contributions through first order in the strong
coupling $\alpha_s$. The full angular dependence of the cross sections is
displayed, separated into transverse $(1 +\cos ^2\theta _\gamma)$ and
longitudinal $(\sin ^2\theta_\gamma)$ components, where $\theta_\gamma$
specifies the direction of the photon with respect to the $e^+e^-$ collision
axis. We discuss extraction of fragmentation functions from $e^+e^-$ data.

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The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org