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We investigate the photoproduction of the $\Theta^+(1540)$ on a nucleon($\gamma n \to K^- \Theta^+$, $\gamma p \to \bar{K}^0 \Theta^+$) and thepion-induced $\Theta^+$ production reaction on the proton ($\pi^- p \to K^-\Theta^+$). The total cross sections near threshold are estimated by usinghadronic models with effective interaction Lagrangians and form factors thatpreserve gauge-invariance of the electromagnetic current. The photoproductioncross sections are found to be a few hundred nb, with the cross section on theproton being larger than that on the neutron. The pion-induced production crosssection is found to be around a few hundred $\mu$b but sensitive to the $K^* N\Theta$ coupling whose value is not yet known. We also study the productioncross section assuming that the $\Theta^+$ has negative parity. The crosssections are then found to be much suppressed compared to the case where$\Theta^+$ has positive parity. Hence, the interpretation of the $\Theta^+$ asan odd-parity pentaquark state seems to be disfavored from the estimates ofcross section for the photon-proton reaction from the SAPHIR experiment.Comment: 17 pages, REVTeX 4, 10 figures, revised version, to appear in Phys.  Rev. D, typos correcte

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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ExoticΘ+baryon production induced by a photon and a pion