Theta^+ baryon production in KN and NN reactions

Details Theta^+ baryon production in KN and NN reactions Theta^+ baryon production in KN and NN reactions

2003-11-04

arxiv.org/abs/hep-ph/0311054v3

Phys.Rev. D69 (2004) 074016

Physics

High Energy Physics

High Energy Physics - Phenomenology

REVTeX, 13 pages, 8 figures, minor revision, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.69.074016

We study $\Theta^+(1540)$ productions in kaon-nucleon ($KN$) and nucleon-nucleon ($NN$) interactions by assuming that the $\Theta^+$ is an isosinglet with $J^P = \frac12^+$. Possible $t$-channel diagrams with $K^*$ exchange are considered in both reactions as well as $K$ exchange in $NN$ reaction. The cross section for $np \to \Lambda^0 \Theta^+$, which has not been considered in previous calculations, is found to be about a factor of 5 larger than that for $np \to \Sigma^0 \Theta^+$ due to the large coupling of $KN\Lambda$ interaction. The cross sections are obtained by setting $g_{KN\Theta}^{}=1$ and varying the ratio of $g_{K^*N\Theta}^{}/g_{KN\Theta}^{}$ so that future experimental data can be used to estimate these couplings. We also find that the isospin relations hold for these reactions.

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