Antikaon angular distributions in the reaction gamma d -> K-Theta(+)p -> K(-)K(+)np near the threshold and the parity of the Theta(+) pentaquark

作者：Paryev E Ya^*

来源：Physics of Atomic Nuclei, 2006, 69(4): 721-733.

DOI：10.1134/S1063778806040168

Within the spectator model, we study the reaction gamma d --> K-Theta(+)p-->K(+)np in the threshold energy region. We present the predictions for the exclusive and inclusive K- -meson angular distributions in the laboratory system for this reaction Calculated for two possible parity states of the Theta(+) resonance at 1.5- and 1.75-GeV beam energies with and without imposing the relevant kinematical cuts on those parts of the sampled phase space where the contribution from the main background Sources, associated with the phi(1020), Lambda(1520) production as well as with the K- p rescattering in the final state, is expected to be dominant. We show that, under the chosen kinematics, these distributions are sensitive to the Theta(+) parity and, therefore, can be used as a filter for the determination of its parity.

• 出版日期2006-4