Precision measurement of the neutron twist-3 matrix element d2n: Probing color forces
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Journal ArticleDate
2014-07-11Author
Posik, MFlay, 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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http://hdl.handle.net/20.500.12613/5871
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10.1103/PhysRevLett.113.022002Abstract
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
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http://dx.doi.org/10.34944/dspace/5853