| Irfu-09-123
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|---|
| Partial wave analysis of the reaction gamma p -> p omega and the search for nucleon resonances |
| M. Williams et al. (J. Ball, M. Garçon, F-X. Girod, S. Procureur, F. Sabatié) |
| An event-based partial wave analysis (PWA) of the reaction gamma p -> p omega has been performed on a high-statistics dataset obtained using the CLAS at Jefferson Lab for center-of-mass energies from
threshold up to 2.4 GeV. This analysis benefits from access to the world\'s first high precision spin density matrix element measurements, available to the event-based PWA through the decay distribution of omega -> pi+ pi- pi0. The data confirm the dominance of the t-channel pi0 exchange amplitude in the forward direction. The dominant resonance contributions are consistent with the previously identified states F15(1680) and D13(1700) near threshold, as well as the G17(2190) at higher energies. Suggestive evidence for the presence of a JP = 5/2+ state around 2GeV, a \"missing\" state, has also been found. Evidence for other states is inconclusive. |
