Proton spin structure in the resonance region

被引：46
|
作者：
Wesselmann, F. R. [1 ]
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.
机构：
[1] Univ Virginia, Charlottesville, VA 22903 USA
[2] Norfolk State Univ, Norfolk, VA 23504 USA
[3] Yerevan Phys Inst, Yerevan 375036, Armenia
[4] N Carolina Agr & Tech State Univ, Greensboro, NC 27411 USA
[5] Univ Basel, CH-4056 Basel, Switzerland
[6] Florida Int Univ, Miami, FL 33199 USA
[7] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA
[8] Mississippi State Univ, Mississippi State, MS 39762 USA
[9] Hampton Univ, Hampton, VA 23668 USA
[10] So Univ, New Orleans, LA 70126 USA
[11] Univ N Carolina, Wilmington, NC 28403 USA
[12] Old Dominion Univ, Norfolk, VA 23529 USA
[13] Tel Aviv Univ, IL-69978 Tel Aviv, Israel
[14] Univ Maryland, College Pk, MD 20742 USA
[15] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 13期
关键词：
D O I：
10.1103/PhysRevLett.98.132003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have examined the spin structure of the proton in the region of the nucleon resonances (1.085 GeV < W < 1.910 GeV) at an average four momentum transfer of Q(2)=1.3 GeV2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A(parallel to) and A(perpendicular to) to high precision, and extracted the asymmetries A(1) and A(2), and the spin structure functions g(1) and g(2). We found a notably nonzero A(perpendicular to), significant contributions from higher-twist effects, and only weak support for polarized quark-hadron duality.
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