Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2005-06-23
Phys.Rev.C72:035206,2005; Erratum-ibid.C72:049901,2005
Physics
Nuclear Physics
Nuclear Theory
34 pages, 22 figures
Scientific paper
10.1103/PhysRevC.72.035206
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.
Daté S.
Kampfer Burkhard
Ohashi Yoji
Titov Alexander I.
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