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    Precision measurement of the neutron twist-3 matrix element d2n: Probing color forces

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    Genre
    Journal Article
    Date
    2014-07-11
    Author
    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, JP
    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
    Kolarkar, A
    Korsch, W
    Kumbartzki, G
    Lerose, JJ
    Lindgren, R
    Liyanage, N
    Long, E
    Lukhanin, A
    Mamyan, V
    McNulty, D
    Meziani, ZE
    Michaels, R
    Mihovilovič, M
    Moffit, B
    Muangma, N
    Nanda, S
    Narayan, A
    Nelyubin, V
    Norum, B
    Nuruzzaman
    Oh, Y
    Peng, JC
    Qian, X
    Qiang, Y
    Rakhman, A
    Riordan, S
    Saha, A
    Sawatzky, B
    Shabestari, MH
    Shahinyan, A
    Širca, S
    Solvignon, P
    Subedi, R
    Sulkosky, V
    Tobias, WA
    Troth, W
    Wang, D
    Wang, Y
    Wojtsekhowski, B
    Yan, X
    Yao, H
    Ye, Y
    Ye, Z
    Yuan, L
    Zhan, X
    Zhang, Y
    Zhang, YW
    Zhao, B
    Zheng, X
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    Subject
    Jefferson Lab Hall A Collaboration
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5871
    
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    DOI
    10.1103/PhysRevLett.113.022002
    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 He3 target. In this dedicated experiment, the spin structure function g2He3 was determined with precision at large x, and the neutron twist-3 matrix element d2n was measured at 〈Q2〉 of 3.21 and 4.32GeV2/c2, 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 〈Q2〉=5GeV2/c2. Combining d2n and a newly extracted twist-4 matrix element f2n, the average neutron color electric and magnetic forces were extracted and found to be of opposite sign and about 30MeV/fm in magnitude. © 2014 American Physical Society.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review Letters
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5853
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