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(-)pi(0). The data confirm the dominance of the t-channel pi(0) exchange amplitude in the forward direction. The dominant resonance contributions are consistent with the previously identified states F(15)(1680) and D(13)(1700) near threshold, as well as the G(17)(2190) at higher energies. Suggestive evidence for the presence of a J(P)=5/2(+) state around 2 GeV, a "missing" state, has also been found. Evidence for other states is inconclusive.
Williams, M., Applegate, D., Bellis, M., Meyer, C., Adhikari, K., Anghinolfi, M., et al. (2009). Partial wave analysis of the reaction γp→pω and the search for nucleon resonances. PHYSICAL REVIEW. C, NUCLEAR PHYSICS, 80(6), 065209-1-065209-18 [10.1103/PhysRevC.80.065209].
Partial wave analysis of the reaction γp→pω and the search for nucleon resonances
D'ANGELO, ANNALISA;PISANO, SILVIA;
2009-12-30
Abstract
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(-)pi(0). The data confirm the dominance of the t-channel pi(0) exchange amplitude in the forward direction. The dominant resonance contributions are consistent with the previously identified states F(15)(1680) and D(13)(1700) near threshold, as well as the G(17)(2190) at higher energies. Suggestive evidence for the presence of a J(P)=5/2(+) state around 2 GeV, a "missing" state, has also been found. Evidence for other states is inconclusive.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
