A further analysis of $Θ^+$ production in $γ+D \to Λ+n+K^{+}$ reaction

Details A further analysis of $Θ^+$ production in $γ+D \to Λ+n+K^{+}$ reaction A further analysis of $Θ^+$ production in $γ+D \to Λ+n+K^{+}$ reaction

2006-08-11

arxiv.org/abs/hep-ph/0608129v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 5 figures

Scientific paper

We analyse Theta+ production in the gamma+D -> \Lambda+n+K+ reaction and study the dependence of the gamma+D -> \Lambda+n+K+ differential cross section on the nK+ invariant mass and on the momentum of the final neutron p_n. We examine the important role of the interference between the signal and background contributions to the gamma+D -> \Lambda+n+K+ amplitude in the extraction of the Theta+ signal from the gamma+D -> \Lambda+n+K+ cross section. We demonstrate that as a result of the cancellation between the interference and signal contributions, the Theta+ signal almost completely washes out after the integration over p_n. This is consistent with the CLAS conclusion that no statistically significant structures in the analysis of the gamma+D -> \Lambda+n+K+ reaction were observed. Therefore, there is no disagreement between the theory and the experiment and the CLAS result does not refute the existence of the Theta+.

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