Publications [#246063] of Haiyan Gao

Papers Published
  1. Kramer, K; Armstrong, DS; Averett, TD; Bertozzi, W; Binet, S; Butuceanu, C; Camsonne, A; Cates, GD; Chen, J-P; Choi, S; Chudakov, E; Cusanno, F; Deur, A; Djawotho, P; Dutta, D; Finn, JM; Gao, H; Garibaldi, F; Gayou, O; Gilman, R; Glamazdin, A; Gorbenko, V; Griffioen, KA; Hansen, J-O; Higinbotham, DW; Hinton, W; Horn, T; Jager, CWD; Jiang, X; Korsch, W; Lerose, J; Lhuillier, D; Liyanage, N; Margaziotis, DJ; McCormick, K; Meziani, Z-E; Michaels, R; Milbrath, B; Moffit, B; Nanda, S; Perdrisat, CF et al., Q2 dependence of the neutron spin structure function g2n at low Q2, Physical Review Letters, vol. 95 no. 14 (2005) [doi] .

    We present the first measurement of the Q2 dependence of the neutron spin structure function g2n at five kinematic points covering 0.57(GeV/c) 2â‰Q2â‰1.34(GeV/c)2 at xâ‰σ0.2. Though the naive quark-parton model predicts g2=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, g2n can be predicted using next-to-leading order fits to world data for g1n. 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 Q2, indicating that contributions such as quark-gluon interactions may be important. Precision data obtained for g1n are consistent with next-to-leading order fits to world data. © 2005 The American Physical Society.