Publications [#246008] of Haiyan Gao

Papers Published
  1. Posik, M; Flay, D; Parno, DS; Allada, K; Armstrong, W; Averett, T; Benmokhtar, F; Bertozzi, W; Camsonne, A; Canan, M; Cates, GD; Chen, C; Chen, J-P; Choi, S; Chudakov, E; Cusanno, F; Dalton, MM; Deconinck, W; de Jager, CW; Deng, X; Deur, A; Dutta, C; El Fassi, L; Franklin, GB; Friend, M; Gao, H; Garibaldi, F; Gilad, S; Gilman, R; Glamazdin, O; Golge, S; Gomez, J; Guo, L; Hansen, O; Higinbotham, DW; Holmstrom, T; Huang, J; Hyde, C; Ibrahim, HF; Jiang, X; Jin, G; Katich, J; Kelleher, A et al., Precision measurement of the neutron twist-3 matrix element d(2)(n): probing color forces., Physical Review Letters, vol. 113 no. 2 (July, 2014), pp. 022002 [doi] .

    Abstract:
    Double-spin asymmetries and absolute cross sections were measured at large Bjorken x  (0.25≤x≤0.90), in both the deep-inelastic and resonance regions, by scattering longitudinally polarized electrons at beam energies of 4.7 and 5.9 GeV from a transversely and longitudinally polarized (3)He target. In this dedicated experiment, the spin structure function g(2)((3)He) was determined with precision at large x, and the neutron twist-3 matrix element d(2)(n) was measured at ⟨Q(2)⟩ of 3.21 and 4.32  GeV(2)/c(2), with an absolute precision of about 10(-5). Our results are found to be in agreement with lattice QCD calculations and resolve the disagreement found with previous data at ⟨Q(2)⟩=5  GeV(2)/c(2). Combining d(2)(n) and a newly extracted twist-4 matrix element f(2)(n), the average neutron color electric and magnetic forces were extracted and found to be of opposite sign and about 30  MeV/fm in magnitude.