Hadron Spectroscopy at CLAS
Meson photoproduction was studied at the CEBAF Large Acceptance Spectrometer (CLAS) utilizing a 5.5 GeV/c photon beam incident on a hydrogen target. Here we report on the partial wave analyzes (PWA) performed on the exclusive final states pi{sup +}pi{sup +}pi{sup -}n and K{sup +}K{sup -}pi{sup +}n. In addition, CLAS has data on the final state pi{sup +}pi{sup 0}pi{sup -}p which will be reported in the near future. The analysis of the pi{sup +}pi{sup +}pi{sup -} system shows clearly the a2(1320), as well as evidence for the a1(1260) and the pi2(1670). The pi1(1600), previously observed in {pi}{sup -}p interactions, is seen very weakly here. In the K{sup +}K{sup -}pi{sup +}n channel there is evidence for the Theta{sup +}(1540) S=+1 baryon pentaquark. The PWA of this system gives an excellent description of the background which rules out mesonic reflection as a source of the signal.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE - Office of Energy Research (ER)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 875482
- Report Number(s):
- JLAB-PHY-05-26; DOE/ER/40150-3690; TRN: US200605%%48
- Journal Information:
- International Journal of Modern Physics A, Vol. 20, Issue 2-3
- Country of Publication:
- United States
- Language:
- English
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