Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\gamma\gamma\rightarrow M^{+}M^{-}(M=\pi, K)$ processes with twist-3
  corrections in QCD   We study the $\gamma\gamma\rightarrow M^{+}M^{-}(M=\pi, K)$ processes with
the contributions from the two-particle twist-2 and twist-3 distribution
amplitudes of pion and kaon mesons on BHL prescription in the standard
hard-scattering approach. The results show that the contributions from twist-3
parts are actually not power suppressed comparing with the leading-twist
contributions and the cross sections agree well with the experimental data in
the two-photon center-of-mass energy $W>2.8$ GeV. We also predict the cross
section ratio $\sigma_{0}(\pi^{+}\pi^{-})/\sigma_{0}(K^{+}K^{-})$, which is
compatible with the experimental data from TPC and Belle.

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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
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The categories of this paper are: eess
28
The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int