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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 ; 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 ;
Date:	14 Dec 2009
Abstract:	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.
Source:	arXiv, 0912.2632
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