Details

Autor(en) / Beteiligte

• Kramer, K.
• Armstrong, D.S.
• Butuceanu, C.
• Djawotho, P.
• Finn, J.M.
• Griffioen, K.A.
• Moffit, B.
• Perdrisat, C.F.
• Roche, J.
• Secrest, J.
• Steiner, D. J.
• Sulkosky, V.
• Zhu, X.
• Averett, T.D.
• College of William and Mary, Williamsburg, Virginia 23187
• Bertozzi, W.
• Dutta, D.
• Gao, H.
• Gayou, O.
• Higinbotham, D.W.
• Sirca, S.

Titel

Q{sup 2} Dependence of the Neutron Spin Structure Function g{sub 2}{sup n} at Low Q{sup 2}

Ist Teil von

• Physical review letters, 2005-09, Vol.95 (14)

Ort / Verlag

United States

Erscheinungsjahr

2005

Quelle

APS_美国物理学会过刊

Beschreibungen/Notizen

• We present the first measurement of the Q{sup 2} dependence of the neutron spin structure function g{sub 2}{sup n} at five kinematic points covering 0.57 (GeV/c){sup 2}{<=}Q{sup 2}{<=}1.34 (GeV/c){sup 2} at x{approx_equal}0.2. Though the naive quark-parton model predicts g{sub 2}=0, nonzero values occur in more realistic models of the nucleon which include quark-gluon correlations, finite quark masses, or orbital angular momentum. When scattering from a noninteracting quark, g{sub 2}{sup n} can be predicted using next-to-leading order fits to world data for g{sub 1}{sup n}. Deviations from this prediction provide an opportunity to examine QCD dynamics in nucleon structure. Our results show a positive deviation from this prediction at lower Q{sup 2}, indicating that contributions such as quark-gluon interactions may be important. Precision data obtained for g{sub 1}{sup n} are consistent with next-to-leading order fits to world data.