Production and Searches for Cascade Baryons with CLAS
We present the results of photoproduction cross sections of the ground state cascade $$\Xi^-$$ and the first excited state $$\Xi^{*-}(1530)$$ measured with the CLAS detector. The photoproduction of the cascade resonances has been investigated in the reactions $$\gamma p \rightarrow K^+K^+(X)$$ and $$\gamma p \rightarrow K^+K^+\pi^-(X)$$. The differential and total cross sections of the $$\Xi^{-}$$ were determined for photon beam energies from 2.75 to 4.75 GeV and are consistent with a production mechanism of $$Y^* \rightarrow K^+ \Xi^-$$ through a t-channel process. The cross-section of the $$\Xi^{*-}(1530)$$ has been determined for photon beam energies from 3.35 to 4.75 GeV. The reaction $$\gamma p \rightarrow K^+K^+ \pi^- (\Xi^0)$$ has also been investigated to search for excited cascade resonances decaying to $$\pi^- \Xi^0$$. No significant signal of excited cascade states other than the well-known $$\Xi^{*-}(1530)$$ is observed. We also present the latest results of a search for the $$\Phi^{--}$$(1862) exotic pentaquark state in a photoproduction experiment on a deuterium target. A high-statistics sample of $$\pi^-\Xi^-$$ events have been collected and analyzed. A preliminary invariant mass spectrum of the $$\pi^-\Xi^-$$ system is presented, which is used to set upper limits on the photoproduction of the $$\Phi^{--}$$ pentaquark state.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 978846
- Report Number(s):
- JLAB-PHY-09-964; DOE/OR/23177-0667; TRN: US1003174
- Journal Information:
- Strangeness in Nuclear and Hadronic Systems, SENDAI08, Conference: Sendai International Symposium On Strangeness In Nuclear And Hadronic Systems (SENDAI 08), 15-18 Dec 2008, Sendai, Japan
- Country of Publication:
- United States
- Language:
- English
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