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Title: Measurements of the separated longitudinal structure function F L from hydrogen and deuterium targets at low Q 2

Structure functions, as measured in lepton-nucleon scattering, have proven to be very useful in studying the partonic dynamics within the nucleon. Furthermore, it is experimentally difficult to separately determine the longitudinal and transverse structure functions, and consequently there are substantially less data available in particular for the longitudinal structure function. Here, we present separated structure functions for hydrogen and deuterium at low four-momentum transfer squared, Q 2 < 1 GeV 2, and compare them with parton distribution parametrization and k T factorization approaches. While differences are found, the parametrizations generally agree with the data, even at the very low-Q 2 scale of the data. The deuterium data show a smaller longitudinal structure function and a smaller ratio of longitudinal to transverse cross section, R, than the proton. This suggests either an unexpected difference in R for the proton and the neutron or a suppression of the gluonic distribution in nuclei.
Authors:
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  1. Hampton Univ., Hampton, VA (United States)
  2. James Madison Univ., Harrisonburg, VA (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Rensselaer Polytechnic Inst., Troy, NY (United States)
  5. North Carolina A&T State Univ., Greensboro, NC (United States)
  6. Bucharest Univ., Magurele (Romania)
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
  8. Yerevan Physics Inst. (YerPhI) (Armenia)
  9. Hampton Univ., Hampton, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  10. The George Washington Univ., Washington, D.C. (United States)
  11. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  12. Vrije Univ., Amsterdam (The Netherlands); Nikhef, Amsterdam (The Netherlands)
  13. Florida International Univ., University Park, FL (United States)
  14. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Massachusetts, Amherst, MA (United States)
  15. Univ. of Regina, Regina, SK (Canada)
  16. Univ. of Maryland, College Park, MD (United States)
  17. Univ. of the Witwatersrand, Johannesburg (South Africa)
  18. Univ. of Virginia, Charlottesville, VA (United States)
  19. Univ. of Houston, Houston, TX (United States)
  20. Mississippi State Univ., Mississippi State, MS (United States)
  21. Triangle Univ. Nuclear Lab and Duke Univ., Durham, NC (United States)
  22. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  23. Univ. of Saskatchewan, Saskatoon, SK (Canada)
  24. Rutgers, The State Univ. of New Jersey, Piscataway, NJ (United States)
  25. Univ. of Connecticut, Storrs, CT (United States)
  26. Univ. of Colorado, Boulder, CO (United States)
  27. Old Dominion Univ., Norfolk, VA (United States)
  28. Ohio Univ., Athens, OH (United States)
  29. Arizona State Univ., Tempe, AZ (United States)
  30. Gettysburg College, Gettysburg, PA (United States)
  31. Univ. of Massachusetts, Amherst, MA (United States)
Publication Date:
Report Number(s):
JLAB-PHY-16-2295; DOE/OR/23177-3874; arXiv:1606.02614
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:
AC05-06OR23177; AC02-06CH11357; PHY-0245045; PHY-0555510; PHY-0653440; PHY-1002644
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1435415
Alternate Identifier(s):
OSTI ID: 1434826; OSTI ID: 1435971