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Posik M, Flay D, Parno DS, et al. Precision measurement of the neutron twist-3 matrix element d(2)(n): probing color forces. Phys Rev Lett. 2014;113(2):022002doi: 10.1103/PhysRevLett.113.022002.
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, 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. (2014). Precision measurement of the neutron twist-3 matrix element d(2)(n): probing color forces. Physical review letters, 113(2), 022002. https://doi.org/10.1103/PhysRevLett.113.022002
Posik, M, et al. "Precision measurement of the neutron twist-3 matrix element d(2)(n): probing color forces." Physical review letters vol. 113,2 (2014): 022002. doi: https://doi.org/10.1103/PhysRevLett.113.022002
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. Precision measurement of the neutron twist-3 matrix element d(2)(n): probing color forces. Phys Rev Lett. 2014 Jul 11;113(2):022002. doi: 10.1103/PhysRevLett.113.022002. Epub 2014 Jul 11. PMID: 25062166.
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Phys Rev Lett. 2014 Jul 11;113(2):022002. doi: 10.1103/PhysRevLett.113.022002. Epub 2014 Jul 11.

Precision measurement of the neutron twist-3 matrix element d(2)(n): probing color forces.

Physical review letters

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

Affiliations

  1. Temple University, Philadelphia, Pennsylvania 19122, USA.
  2. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA and Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA.
  3. University of Kentucky, Lexington, Kentucky 40506, USA.
  4. College of William and Mary, Williamsburg, Virginia 23187, USA.
  5. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA and Duquesne University, Pittsburgh, Pennsylvania 15282, USA.
  6. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  7. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  8. Old Dominion University, Norfolk, Virginia 23529, USA.
  9. University of Virginia, Charlottesville, Virginia 22904, USA.
  10. Hampton University, Hampton, Virginia 23187, USA.
  11. Seoul National University, Seoul 151-742, South Korea.
  12. INFN, Sezione di Roma, I-00161 Rome, Italy and Istituto Superiore di Sanità, I-00161 Rome, Italy.
  13. Old Dominion University, Norfolk, Virginia 23529, USA and Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA.
  14. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  15. Duke University, Durham, North Carolina 27708, USA.
  16. INFN, Sezione di Roma, I-00161 Rome, Italy.
  17. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA.
  18. Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine.
  19. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  20. Longwood University, Farmville, Virginia 23909, USA.
  21. Old Dominion University, Norfolk, Virginia 23529, USA and Université Blaise Pascal/IN2P3, F-63177 Aubière, France.
  22. Cairo University, Giza 12613, Egypt.
  23. Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA and Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  24. Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA.
  25. Kent State University, Kent, Ohio 44242, USA.
  26. University of Massachusetts, Amherst, Massachusetts 01003, USA.
  27. Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia.
  28. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA and Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  29. Mississippi State University, Mississippi 39762, USA.
  30. University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
  31. Duke University, Durham, North Carolina 27708, USA and Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA.
  32. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Duke University, Durham, North Carolina 27708, USA.
  33. Syracuse University, Syracuse, New York 13244, USA.
  34. University of Virginia, Charlottesville, Virginia 22904, USA and University of Massachusetts, Amherst, Massachusetts 01003, USA.
  35. Temple University, Philadelphia, Pennsylvania 19122, USA and Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  36. Yerevan Physics Institute, Yerevan 375036, Armenia.
  37. Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia and University of Ljubljana, SI-1000 Ljubljana, Slovenia.
  38. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Argonne National Lab, Argonne, Illinois 60439, USA.
  39. University of Science and Technology of China, Hefei 230026, People's Republic of China.
  40. Temple University, Philadelphia, Pennsylvania 19122, USA and College of William and Mary, Williamsburg, Virginia 23187, USA.
  41. Lanzhou University, Lanzhou 730000, Gansu, People's Republic of China.
  42. Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA and Lanzhou University, Lanzhou 730000, Gansu, People's Republic of China.

PMID: 25062166 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 (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.

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