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Proton spin structure in the resonance region.
Wesselmann, F R; Slifer, K; Tajima, S; Aghalaryan, A; Ahmidouch, A; Asaturyan, R; Bloch, F; Boeglin, W; Bosted, P; Carasco, C; Carlini, R; Cha, J; Chen, J P; Christy, M E; Cole, L; Coman, L; Crabb, D; Danagoulian, S; Day, D; Dunne, J; Elaasar, M; Ent, R; Fenker, H; Frlez, E; Gan, L; Gaskell, D; Gomez, J; Hu, B; Jones, M K; Jourdan, J; Keith, C; Keppel, C E; Khandaker, M; Klein, A; Kramer, L; Liang, Y; Lichtenstadt, J; Lindgren, R; Mack, D; McKee, P; McNulty, D; Meekins, D; Mkrtchyan, H; Nasseripour, R; Niculescu, I; Normand, K; Norum, B; Pocanic, D; Prok, Y; Raue, B.
Affiliation
  • Wesselmann FR; University of Virginia, Charlottesville, VA 22903, USA.
Phys Rev Lett ; 98(13): 132003, 2007 Mar 30.
Article in En | MEDLINE | ID: mdl-17501192
ABSTRACT
We have examined the spin structure of the proton in the region of the nucleon resonances (1.085 GeVelectron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A|| and A(perpendicular) to high precision, and extracted the asymmetries A1 and A2, and the spin structure functions g1 and g2. We found a notably nonzero A(perpendicular), significant contributions from higher-twist effects, and only weak support for polarized quark-hadron duality.
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2007 Document type: Article
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2007 Document type: Article