Photoproduction of meson pairs: First measurement of the polarization observable I^s

E. Gutz , V. Sokhoyan , H. van Pee , A.V. Anisovich , J.C.S. Bacelar , B. Bantes , O. Bartholomy , D. Bayadilov

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R. Beck Yu. Beloglazov R. Castelijns V. Crede H. Dutz D. Elsner R. Ewald F. Frommberger M. Fuchs Ch. Funke R. Gregor A. Gridnev W. Hillert Ph. Hoffmeister I. Horn I. Jaegle J. Junkersfeld H. Kalinowsky S. Kammer V. Kleber Frank Klein Friedrich Klein E. Klempt M. Kotulla B. Krusche M. Lang H. Loehner I. Lopatin S. Lugert D. Menze T. Mertens J.G. Messchendorp V. Metag M. Nanova V. Nikonov D. Novinski R. Novotny M. Ostrick L. Pant M. Pfeiffer D. Piontek W. Roberts A. Roy A. Sarantsev S. Schadmand Ch. Schmidt H. Schmieden B. Schoch S. Shende A. Suele V. Sumachev T. Szczepanek A. Thiel U. Thoma D. Trnka R. Varma D. Walther Ch. Weinheimer Ch. Wendel

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keywords polarizationdemonstratefirstobservablepartialreactionacoplanaralong

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The polarization observable I^s, 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 g p -> p pi0 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 I^s to the dynamics of the reaction. Fits using Bonn-Gatchina partial wave analysis demonstrate that the new polarization observables carry significant information on the contributing partial waves.

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Photoproduction of meson pairs: First measurement of the polarization observable I^s

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