First pion photoproduction double-polarization results with polarized (H)over-right-arrow(D)over-right-arrow at LEGS

A Lehmann,CS Whisnant, C Cacace,A Caracappa,S Hoblit,OC Kistner, A Kuczewski,F Lincoln,M Lowry,L Miceli,AM Sandorfi, C Thorn, M Khandaker, K Ardashev, C Bade, R Deininger,K Hicks,M Lucas,J Mahon,A Honig,A D'Angelo,A d'Angelo,R Di Salvo, D Moriccianni,C Schaerf, C Commeaux,JP Didelez,I Danchev,C Gibson, BM Preedom,A Cichocki, B Norum,K Wang, M Blecher,T Kageya, H Meyer,T Saitoh

NSTAR 2002: PROCEEDINGS OF THE WORKSHOP ON THE PHYSICS OF EXCITED NUCLEONS（2003）

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摘要

The first beam-target double-polarization data taken with a new polarized target using HD in the solid phase are reported here. Preliminary pion photo-production results on the double-polarization observables G and E are shown for the proton. The latter determines the size of the GDH observable sigma(1/2) - sigma(3/2). Preliminary results for this quantity are also given.

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