764 articles – 7606 Notices  [english version]
 HAL : in2p3-00185249, version 1
 arXiv : nucl-ex/0702027
 Physical Review C 76 (2007) 025208
 Cascade production in the reactions $\gamma$ p --> K+ K+ (X) and $\gamma$ p --> K^+ K^+ $\pi$- (X)
 CLAS Collaboration(s)
 (2007)
 Photoproduction of the cascade resonances has been investigated in the reactions $\gamma p \to K^+ K^+ (X)$ and $\gamma p \to K^+ K^+ \pi^- (X)$. The mass split of the $\Xi$ doublet is measured to be $5.4\pm 1.8$ 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 possible production mechanism of $Y^*\to K^+\Xi^-$ through a $t$-channel process. The reaction $\gamma p \to K^+ K^+ \pi^-[\Xi^0]$ has also been investigated in 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.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/nucl-ex/0702027
 in2p3-00185249, version 1 http://hal.in2p3.fr/in2p3-00185249 oai:hal.in2p3.fr:in2p3-00185249 Contributeur : Suzanne Robert <> Soumis le : Lundi 5 Novembre 2007, 15:52:37 Dernière modification le : Lundi 5 Novembre 2007, 18:41:57