Production of the pentaquark $Θ^+$ in $np$ scattering

Details Production of the pentaquark $Θ^+$ in $np$ scattering Production of the pentaquark $Θ^+$ in $np$ scattering

2004-02-13

arxiv.org/abs/hep-ph/0402138v2

Phys.Rev. D70 (2004) 114027

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages and 11 figures

Scientific paper

10.1103/PhysRevD.70.114027

We study $np\to \Lambda\Theta^{+}$ and $np\to \Sigma^{0}\Theta^{+}$ processes for both of the positive and negative parities of the $\Theta^{+}$. Employing the effective chiral Lagrangians for the $KNY$ and $K^*NY$ interactions, we calculate differential cross sections as well as total cross sections for the $np\to \Sigma^0 \Theta^+$ and $np\to \Lambda\Theta^+$ reactions. The total cross sections for the positive-parity $\Theta^+$ turn out to be approximately ten times larger than those for the negative parity $\Theta^+$ in the range of the CM energy $\sqrt{s}_{\rm th}\le \sqrt{s}\le 3.5 {\rm GeV}$. The results are rather sensitive to the mechanism of $K$ exchanges in the $t$ -- channel.

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