Precision Measurement of the Neutron Twist-3 Matrix Element d[n over 2]: Probing Color Forces

Posik, M.; Flay, D.; Parno, D. S.; Allada, K.; Armstrong, W.; Averett, T.; Benmokhtar, F.; Bertozzi, W.; Camsonne, A.; Canan, M.; Cates, G. D.; Chen, C.; Chen, J.-P.; Choi, S.; Chudakov, E.; Cusanno, F.; Dalton, M. M.; Deconinck, W.; de Jager, C. W.; Deng, X.; Deur, A.; Dutta, C.; El Fassi, L.; Franklin, G. B.; Friend, M.; Gao, H.; Garibaldi, F.; Gilad, S.; Gilman, R.; Glamazdin, O.; Golge, S.; Gomez, J.; Guo, L.; Hansen, O.; Higinbotham, D. W.; Holmstrom, T.; Huang, J.; Hyde, C.; Ibrahim, H. F.; Jiang, X.; Jin, G.; Katich, J.; Kelleher, A.; Kolarkar, A.; Korsch, W.; Kumbartzki, G.; LeRose, J. J.; Lindgren, R.; Liyanage, N.; Long, E.; Lukhanin, A.; Mamyan, V.; McNulty, D.; Meziani, Z.-E.; Michaels, R.; Mihovilovič, M.; Moffit, B.; Muangma, N.; Nanda, S.; Narayan, A.; Nelyubin, V.; Norum, B.; Nuruzzaman, B.; Oh, Y.; Peng, J. C.; Qian, X.; Qiang, Y.; Rakhman, A.; Riordan, S.; Saha, A.; Sawatzky, B.; Shabestari, M. H.; Shahinyan, A.; Širca, S.; Solvignon, P.; Subedi, R.; Sulkosky, V.; Tobias, W. A.; Troth, W.; Wang, D.; Wang, Y.; Wojtsekhowski, B.; Yan, X.; Yao, H.; Ye, Y.; Ye, Z.; Yuan, L.; Zhan, X.; Zhang, Y.; Zhang, Y.-W.; Zhao, B.; Zheng, X.

Author(s)

Posik, M.; Flay, D.; Parno, D. S.; Allada, Kalyan C.; Armstrong, W.; ... Show more

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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 [superscript 3]He target. In this dedicated experiment, the spin structure function [3 over g2][superscript He] was determined with precision at large x, and the neutron twist-3 matrix element d[n over 2] was measured at ⟨Q[superscript 2]⟩ of 3.21 and 4.32 GeV[superscript 2]/c[superscript 2], with an absolute precision of about 10[superscript -5]. Our results are found to be in agreement with lattice QCD calculations and resolve the disagreement found with previous data at ⟨Q[superscript 2]⟩ = 5 GeV[superscript 2]/c[superscript 2]. Combining d[n over 2] and a newly extracted twist-4 matrix element f[n over 2], the average neutron color electric and magnetic forces were extracted and found to be of opposite sign and about 30 MeV/fm in magnitude.

Date issued

2014-07

URI

http://hdl.handle.net/1721.1/88640

Department

Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Physical Review Letters

Publisher

American Physical Society

Citation

Posik, M., D. Flay, D. S. Parno, K. Allada, W. Armstrong, T. Averett, F. Benmokhtar, et al. “Precision Measurement of the Neutron Twist-3 Matrix Element d[n over 2]: Probing Color Forces.” Physical Review Letters 113, no. 2 (July 2014). © 2014 American Physical Society

Version: Final published version

ISSN

0031-9007

1079-7114

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