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Preliminary Results On Eta ' Photoproduction At Graal

M Manganaro,V Bellini,J P Bocquet,L Casano,A Dangelo,R Di Salvo,A Fantini,D Franco,G Gervino,F Ghio,G Giardina,A Giusa,B Girolami,A S Ignatov,A Lapik,P Levi Sandri,A Lleres,F Mammoliti,G Mandaglio,D Moricciani,A Mushkarenkov,V Nedorezov,C Randieri,D Rebreyend,N Rudnev,G Russo,C Schaerf,M L Sperduto,M C Sutera,A Turinge,V Vegna

INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS（2010）

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摘要
The gamma p -> eta'p reaction was studied near the threshold, in the 1.44 GeV > E(gamma) < 1.55GeV energy range with the tagged photons of the former GRAAL experiment. The two neutral decays gamma gamma(Gamma(i)/Gamma = 2.10 +/- 0.12%) and pi(0)pi(0)eta(Gamma(i)/Gamma = 20.7 +/- 1.2%) were analized and preliminary results of the beam asymmetry were extracted together with the invariant masses.
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