Photoproduction of the cascade resonances has been investigated in the reactions gamma p -> K+K+(X) and gamma p -> K+K+pi(-)(X). The mass splitting of the ground state (Xi(-),Xi(0)) doublet is measured to be 5.4 +/- 1.8 MeV/c(2), consistent with existing measurements. The differential (total) cross sections for the Xi(-) have been determined for photon beam energies from 2.75 to 3.85 (4.75) GeV and are consistent with a production mechanism of Y-*-> K+Xi(-) through a t-channel process. The reaction gamma p -> K+K+pi(-)[Xi(0)] has also been investigated to search of excited cascade resonances. No significant signal of excited cascade states other than the Xi(-)(1530) is observed. The cross-section results of the Xi(-)(1530) have also been obtained for photon beam energies from 3.35 to 4.75 GeV.
CASCADE PRODUCTION IN THE REACTIONS GAMMA P ---> K+ K+ (X) AND GAMMA P ---> K+ K+ PI- (X)
RICCO, GIOVANNI;TAIUTI, MAURO GINO;
2007-01-01
Abstract
Photoproduction of the cascade resonances has been investigated in the reactions gamma p -> K+K+(X) and gamma p -> K+K+pi(-)(X). The mass splitting of the ground state (Xi(-),Xi(0)) doublet is measured to be 5.4 +/- 1.8 MeV/c(2), consistent with existing measurements. The differential (total) cross sections for the Xi(-) have been determined for photon beam energies from 2.75 to 3.85 (4.75) GeV and are consistent with a production mechanism of Y-*-> K+Xi(-) through a t-channel process. The reaction gamma p -> K+K+pi(-)[Xi(0)] has also been investigated to search of excited cascade resonances. No significant signal of excited cascade states other than the Xi(-)(1530) is observed. The cross-section results of the Xi(-)(1530) have also been obtained for photon beam energies from 3.35 to 4.75 GeV.
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