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Measurement of the Beam Asymmetry $Sigma$ in the Forward Direction for pi0 Photoproduction
N. Sparks ; V. Crede ; A. V. Anisovich ; J. C. S. Bacelar ; R. Bantes ; O. Bartholomy ; D. Bayadilov ; R. Beck ; Y. A. Beloglazov ; R. Castelijns ; D. Elsner ; R. Ewald ; F. Frommberger ; C. Funke ; R. Gregor ; A. Gridnev ; E. Gutz ; W. Hillert ; P. Hoffmeister ; I. Jaegle ; J. Junkersfeld ; H. Kalinowsky ; S. Kammer ; Frank Klein ; Friedrich Klein ; E. Klempt ; M. Kotulla ; B. Krusche ; H. Loehner ; I. V. Lopatin ; S. Lugert ; D. Menze ; T. Mertens ; J. G. Messchendorp ; V. Metag ; M. Nanova ; V. A. Nikonov ; D. Novinski ; R. Novotny ; M. Ostrick ; L. M. Pant ; H. Pee ; M. Pfeiffer ; A. Roy ; A. V. Sarantsev ; S. Schadmand ; C. Schmidt ; H. Schmieden ; B. Schoch ; S. Shende ; V. Sokhoyan ; A. Suele ; V.V. Sumachev ; T. Szczepanek ; U. Thoma ; D. Trnka ; R. Varma ; D. Walther ; C. Wendel ; A. Wilson ;
Date:	6 Mar 2010
Abstract:	Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector for photon energies between 0.9 and 1.66 GeV at the electron accelerator ELSA. The beam asymmetry $Sigma$ has been extracted for $115^circ < heta_{c.m.} < 155^circ$ of the $pi^0$ meson and for $ heta_{c.m.} < 60^circ$. For the first time, these beam-asymmetry data cover the very forward region and improve the world database for photon energies above 1.5 GeV. The angular dependence of $Sigma$ shows an overall good agreement with the SAID parametrization.
Source:	arXiv, 1003.1346
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