Photoproduction of meson pairs : first measurement of the polarization observable I-s CBELSA/TAPS Collaboration

The polarization observable 15, a feature exclusive to the acoplanar kinematics of multi-meson final states produced via linearly polarized photons, has been measured for the first time. Results for the reaction (gamma) over barp -< p pi(0)eta are presented for incoming photon energies between 970 MeV and 1650 MeV along with the beam asymmetry I-c. The comparably large asymmetries demonstrate a high sensitivity of Is to the dynamics of the reaction. The sensitivity of these new polarization observables to the contributing partial waves is demonstrated by fits using the Bonn-Gatchina partial wave analysis. (C) 2010 Elsevier B.V. All rights reserved.