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• W1973297119 abstract "We investigate the photoproduction of the $Theta^+(1540)$ on a nucleon ($gamma n to K^- Theta^+$, $gamma p to bar{K}^0 Theta^+$) and the pion-induced $Theta^+$ production reaction on the proton ($pi^- p to K^- Theta^+$). The total cross sections near threshold are estimated by using hadronic models with effective interaction Lagrangians and form factors that preserve gauge-invariance of the electromagnetic current. The photoproduction cross sections are found to be a few hundred nb, with the cross section on the proton being larger than that on the neutron. The pion-induced production cross section 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 production cross section assuming that the $Theta^+$ has negative parity. The cross sections are then found to be much suppressed compared to the case where $Theta^+$ has positive parity. Hence, the interpretation of the $Theta^+$ as an odd-parity pentaquark state seems to be disfavored from the estimates of cross section for the photon-proton reaction from the SAPHIR experiment." @default.
• W1973297119 created "2016-06-24" @default.
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• W1973297119 date "2004-01-28" @default.
• W1973297119 modified "2023-10-16" @default.
• W1973297119 title "ExoticΘ+baryon production induced by a photon and a pion" @default.
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• W1973297119 doi "https://doi.org/10.1103/physrevd.69.014009" @default.
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