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Precision measurement of the neutron twist-3 matrix element d(2)(n): 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.
Affiliation
  • Posik M; Temple University, Philadelphia, Pennsylvania 19122, USA.
  • Flay D; Temple University, Philadelphia, Pennsylvania 19122, USA.
  • Parno DS; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA and Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA.
  • Allada K; University of Kentucky, Lexington, Kentucky 40506, USA.
  • Armstrong W; Temple University, Philadelphia, Pennsylvania 19122, USA.
  • Averett T; College of William and Mary, Williamsburg, Virginia 23187, USA.
  • Benmokhtar F; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA and Duquesne University, Pittsburgh, Pennsylvania 15282, USA.
  • Bertozzi W; Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • Camsonne A; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Canan M; Old Dominion University, Norfolk, Virginia 23529, USA.
  • Cates GD; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Chen C; Hampton University, Hampton, Virginia 23187, USA.
  • Chen JP; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Choi S; Seoul National University, Seoul 151-742, South Korea.
  • Chudakov E; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Cusanno F; INFN, Sezione di Roma, I-00161 Rome, Italy and Istituto Superiore di Sanità, I-00161 Rome, Italy.
  • Dalton MM; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Deconinck W; Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • de Jager CW; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Deng X; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Deur A; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Dutta C; University of Kentucky, Lexington, Kentucky 40506, USA.
  • El Fassi L; Old Dominion University, Norfolk, Virginia 23529, USA and Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA.
  • Franklin GB; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Friend M; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Gao H; Duke University, Durham, North Carolina 27708, USA.
  • Garibaldi F; INFN, Sezione di Roma, I-00161 Rome, Italy.
  • Gilad S; Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • Gilman R; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA.
  • Glamazdin O; Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine.
  • Golge S; Old Dominion University, Norfolk, Virginia 23529, USA.
  • Gomez J; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Guo L; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Hansen O; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Higinbotham DW; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Holmstrom T; Longwood University, Farmville, Virginia 23909, USA.
  • Huang J; Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • Hyde C; Old Dominion University, Norfolk, Virginia 23529, USA and Université Blaise Pascal/IN2P3, F-63177 Aubière, France.
  • Ibrahim HF; Cairo University, Giza 12613, Egypt.
  • Jiang X; Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA and Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Jin G; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Katich J; College of William and Mary, Williamsburg, Virginia 23187, USA.
  • Kelleher A; College of William and Mary, Williamsburg, Virginia 23187, USA.
  • Kolarkar A; University of Kentucky, Lexington, Kentucky 40506, USA.
  • Korsch W; University of Kentucky, Lexington, Kentucky 40506, USA.
  • Kumbartzki G; Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA.
  • LeRose JJ; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Lindgren R; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Liyanage N; University of Virginia, Charlottesville, Virginia 22904, USA.
  • Long E; Kent State University, Kent, Ohio 44242, USA.
Phys Rev Lett ; 113(2): 022002, 2014 Jul 11.
Article in En | MEDLINE | ID: mdl-25062166
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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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2014 Document type: Article Affiliation country:
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2014 Document type: Article Affiliation country: