Theta^+ baryon production in KN and NN reactions

Abstract

We study ${\Theta }^{+}(1540)$ productions in kaon-nucleon ($KN$) and nucleon-nucleon ($NN$) interactions by assuming that the ${\Theta }^{+}$ is an isosinglet with $J^P={\frac{1}{2}}^{+}$. Possible $t$-channel diagrams with $K^{\ast }$ 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 $g_{K^{\ast }N\Theta }^{}/g_{KN\Theta }^{}$ so that future experimental data can be used to estimate these couplings. We also find that the isospin relations hold for these reactions.

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

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Cited by in corpus (21)

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• A Naturally Narrow Positive Parity Theta^+
• Pentaquark baryons in SU(3) quark model
• Octet, decuplet and antidecuplet magnetic moments in the chiral quark soliton model revisited
• Search for Theta+ via K+p -> pi+X reaction with a 1.2 GeV/c K+ beam
• High-resolution search for the ${\Theta }^{+}$ pentaquark via a pion-induced reaction at J-PARC
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• On the determination of the parity of the ${\Theta }^{+}$
• A Phenomenological Lagrangian Approach to Two Kaon Photoproduction and Pentaquark Searches
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• Spin asymmetries in gamma + N --> K*bar + Theta^+
• Threshold production of the ${\Theta }^{+}$ in a polarized proton reaction
• Two-meson cloud contribution to the baryon antidecuplet binding
• Anti-charmed pentaquark from B decays
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• Phenomenological study of two-meson couplings of Theta+
• Production of the pentaquark ${\Theta }^{+}$ in $np$ scattering
• Polarization Observables in $\gamma N\to K\bar{K}N$