Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent Theta^+ and Lambda(1520) photoproduction off the deuteron   We analyze an effect of the coherent $\Theta^+\Lambda(1520)$ photoproduction
in $\gamma D$ interaction near the threshold. We demonstrate that the coherence
effect becomes manifest in a comparison of the $nK^+$ invariant mass
distribution when the $pK^-$ invariant equals the $\Lambda(1520)$ mass. Our
model calculations indicate a sizeable contribution of resonant and
non-resonant background processes in the $\gamma D\to np K^+K^-$ reaction which
generally exceed the contribution of the coherent resonant channel. However, we
find that the coherent $\Theta^+\Lambda(1520)$ photoproduction is enhanced
relative to the background processes in the forward hemisphere of the $pK^-$
pair photoproduction. Moreover, the coherence effect does not depend on the
$\Theta^+$ photoproduction amplitude and is defined by the probabilities of the
$\Lambda(1520)$ photoproduction and the $\Theta^+\to NK$ transition. Therefore,
this coherence effect may be used as an independent method for studying the
mechanism of $\Theta^+$ production and $\Theta^+$ properties.

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The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
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The categories of this paper are: cs