Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Contributions of box diagrams and $\Delta(1940)$ resonance to
  $K^0\Sigma^+$ photoproduction   We study first the box-diagram contribution to the $\gamma p\,\rightarrow
\,K^0\Sigma^+$ process to understand the anomaly of the kaon photoproduction
cross section from CBELSA/TAPS experiment at Electron Stretcher Accelerator
(ELSA), where the imaginary part of the scattering amplitude from the
box-diagrams is calculated by using Cutkosky's rules in the on-shell
approximation while the real part of the amplitude is derived by dispersion
relation calculations. Together with the results of the K-MAID model, the
contribution of the box-diagrams fails to provide the sudden drop of the
differential cross-section between the $K^*\,\Lambda$ and $K^*\,\Sigma$
thresholds. In addition, we include the $\Delta(1940)$ resonance in the process
to complete the description of the differential cross-section. Combining the
contributions from the K-MAID model, the box-diagrams and the $\Delta(1940)$
resonance, we have obtained the theoretical differential cross-section the
$\gamma p\,\rightarrow \,K^0\Sigma^+$ process, which is compatible with the
CBELSA/TAPS experimental data.

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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math