Pentaquark Theta(+) production from photon-nucleon reactions
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Pentaquark + baryon production from photon-nucleon reactions is studied in a hadronic model that uses empirical hadron masses and coupling constants as well as includes both heta; and K*N couplings. Taking g K N = 3.0 corresponding to a + width of 9 MeV, g K* N = g K N , and a cutoff parameter = 1.2 GeV in form factors, both the + total production cross section and angular distribution are evaluated. For the reaction p K 0 +, the total cross section for producing a positive parity + is about 300 nb at photon energy E = 3 GeV, comparable to the quoted cross section from the SAPHIR experiment at Bonn Electron Stretcher Accelerator. The cross sections for the other reactions n K - +, p K *0 +, and n K*- + at E = 3 GeV are about 250 nb, 125 nb, and 1350 nb, respectively, if the parity of + is positive. The angular distributions of produced + in these reactions all peak at forward angles. For negative parity +, the total cross sections for these reactions are reduced by more than an order of magnitude, while their angular distributions remain forward peaked. Elsevier B.V. All rights reserved.