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Title: Polarization transfer observables in elastic electron-proton scattering at Q 2 = 2.5 , 5.2, 6.8, and 8.5   GeV 2

Journal Article · · Physical Review C
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  1. Univ. of Connecticut, Storrs, CT (United States)
  2. Christopher Newport Univ., Newport News, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Lanzhou Univ., Gansu (People's Republic of China)
  5. College of William and Mary, Williamsburg, VA (United States)
  6. Norfolk State Univ., Norfolk, VA (United States)
  7. George Washington Univ., Washington, DC (United States)
  8. North Carolina A&T State Univ., Greensboro, NC (United States)
  9. Hampton Univ., Hampton, VA (United States)
  10. California State Univ. Los Angeles, Los Angeles, CA (United States)
  11. Argonne National Lab. (ANL), Argonne, IL (United States)
  12. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia)
  13. Univ. of Virginia, Charlottesville, VA (United States)
  14. Duquesne Univ., Pittsburgh, PA (United States)
  15. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  16. CNRS/IN2P3 and Univ. Paris-Sud (France)
  17. Florida Intl Univ., Miami, FL (United States)
  18. Univ. of Regina, Regina, SK (Canada)
  19. Christopher Newport Univ., Newport News, VA (United States)
  20. JINR-LHE, Moscow Region (Russia)
  21. Ohio Univ., Athens, OH (United States)
  22. IHEP, Moscow Region (Russia)
  23. Sezione Sanita and Istituto Superiore di Sanita, Rome (Italy)
  24. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Rutgers Univ., Piscataway, NJ (United States)
  25. Univ. of Glasgow, Scotland (United Kingdom)
  26. Christopher Newport Univ. Newport News, VA (United States)
  27. Rutgers Univ., Piscataway, NJ (United States)
  28. California State Univ Los Angeles, Los Angeles, CA (United States)
  29. Univ. of Witwatersrand, Johannesburg (South Africa)
  30. Univ. of Maryland, College Park, MD (United States)
  31. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  32. Mississippi State Univ., Mississippi State, MS (United States)
  33. Univ. of Chemical Technology and Metallurgy, Sofia (Bulgaria)
  34. Univ. of Tel Aviv, Tel Aviv (Israel)
  35. Univ. of Ljubljana, Ljubljana (Slovenia); Jozef Stefan Institute, Ljubljana (Slovenia)
  36. CNRS/IN2P3 and Univ. Paris-Sud (France); DSM, IRFU, SPhN, Gif-sur-Yvette (France)
+ Show Author Affiliations

In this paper, interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio GpE/GpM of the proton's electric and magnetic form factors for momentum transfers Q2 ≳ 1 GeV2, in strong disagreement with previous extractions of this ratio using the traditional Rosenbluth separation technique. The GEp-III and GEp-2$$\gamma$$ experiments were carried out in Jefferson Lab's (JLab's) Hall C from 2007-2008, to extend the knowledge of $$G_E^p/G_M^p$$ to the highest practically achievable $Q^2$ and to search for effects beyond the Born approximation in polarization transfer observables of elastic $$\vec{e}p$$ scattering. This article reports an expanded description of the common experimental apparatus and data analysis procedure, and the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance data of the GEp-2$$\gamma$$ experiment. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2$$\gamma$$ data are significantly reduced at $$\epsilon = 0.632$$ and $0.783$ relative to the original publication. The decrease with $Q^2$ of $$G_E^p/G_M^p$$ continues to $Q^2 = 8.5$ GeV$^2$, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At $Q^2 = 2.5$ GeV$^2$, the proton form factor ratio $$G_E^p/G_M^p$$ shows no statistically significant $$\epsilon$$-dependence, as expected in the Born approximation. The ratio $$P_\ell/P_\ell^{Born}$$ of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.7\% at $$\epsilon = 0.783$$ relative to $$\epsilon = 0.149$$, with $$\approx 2.2\sigma$$ significance based on the total uncertainty, implying a similar effect in the transverse component $$P_t$$ that cancels in the ratio $$R$$.

Research Organization:
Univ. of Connecticut, Storrs, CT (United States); Mississippi State Univ., Starkville, MS (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Centre National de la Recherche Scientifique (CNRS); Natural Science and Engineering Research Council of Canada
Grant/Contract Number:
SC0014230; FG02-07ER41528; AC02-06CH11357; AC05-06OR23177; AC02-76SF00515; AC02-05CH11231
OSTI ID:
1406995
Alternate ID(s):
OSTI ID: 1407450; OSTI ID: 1409061; OSTI ID: 1410521; OSTI ID: 1411040; OSTI ID: 1830319
Report Number(s):
JLAB-PHY-17-2533; DOE/OR/23177-4207; arXiv:1707.08587; PRVCAN; TRN: US1703268
Journal Information:
Physical Review C, Vol. 96, Issue 5; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

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