Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: EKHARA 3.0: an update of the EKHARA Monte Carlo event generator   The Monte Carlo event generator EKHARA was upgraded during last years.
  The upgrades presented here contain: a) the inclusion of new final states
$e^+e^-\to e^+e^-\eta $, $e^+e^-\to e^+e^-\eta'$, $e^+e^-\to e^+e^- \chi_{c_i}
$ and $e^+e^-\to e^+e^- \chi_{c_i} (\to J/\psi (\to \mu^+\mu^-)\gamma)$; b) new
$\gamma^*-\gamma^*-P$ transition form factors and c) the radiative corrections
to the reactions $e^+e^-\to e^+e^-P $. For the upgrades a) and b), we present
here only the pieces missing in other publications, mostly algorithms used in
the phase space generation. The radiative corrections are presented here for
the first time. A new algorithm of the phase space generation for the reaction
$e^+e^-\to e^+e^-P \gamma$ being its main part. A comparison with GGRESRC
generator is presented. Big differences between the radiative corrections
calculated by the EKHARA and the GGRESRC generators are observed.

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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: solv-int