Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-02-13
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.
Hosaka Atsushi
Kim H.-Ch.
Nam S. I.
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