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Measurement of R= σL / σT and the separated longitudinal and transverse structure functions in the nucleon-resonance region

Journal Article · · Physical Review. C
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  1. American University, Washington, DC (United States); Hampton Univ., Hampton, VA (United States)
  2. Hampton Univ., Hampton, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Hampton Univ., Hampton, VA (United States)
  4. North Carolina A & T State Univ., Greensboro, NC (United States)
  5. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Yerevan Physics Inst. (YerPhI) (Armenia)
  8. Univ. of Illinois at Urbana-Champaign, IL (United States)
  9. Vrije Univ., Amsterdam (Netherlands)
  10. Florida International Univ. (FIU), Miami, FL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  11. American University, Washington, DC (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  12. Univ. of Maryland, College Park, MD (United States)
  13. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  14. Mississippi State Univ., Mississippi State, MS (United States)
  15. Univ. of Virginia, Charlottesville, VA (United States)
  16. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Mississippi State Univ., Mississippi State, MS (United States)
  17. Univ. of Colorado, Boulder, CO (United States)
  18. Argonne National Lab. (ANL), Argonne, IL (United States); Oregon State Univ., Corvallis, OR (United States)
  19. Argonne National Lab. (ANL), Argonne, IL (United States)
  20. Rutgers Univ., New Brunswick, NJ (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  21. Rutgers Univ., New Brunswick, NJ (United States)
  22. Univ. of Michigan, Ann Arbor, MI (United States)
  23. New Mexico State Univ., Las Cruces, NM (United States)
  24. Florida State Univ., Tallahassee, FL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  25. Ohio Univ., Athens, OH (United States)
  26. George Washington Univ., Washington, DC (United States)
  27. New Mexico State Univ., Las Cruces, NM (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  28. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); College of William and Mary, Williamsburg, VA (United States)
  29. Florida State Univ., Tallahassee, FL (United States)
  30. Univ. of Maryland, College Park, MD (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  31. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
+ Show Author Affiliations
Here we report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2 < Q2 < 5.5 GeV2. The data have been used to accurately perform over 170 Rosenbluth-type longitudinal/transverse separations. The precision R = $$\sigma_{L} /\sigma _{T}$$ data are presented here, along with the first separate values of the inelastic structure functions F1 and FL in this regime. The resonance longitudinal component is found to be significant. With the new data, quark-hadron duality is observed above Q2 = 1 GeV2 in the separated structure functions independently.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Energy Research (ER); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; AC05-84ER40150
OSTI ID:
836275
Alternate ID(s):
OSTI ID: 1894086
Report Number(s):
DOE/ER/40150-3076; JLAB-PHY-04-45; nucl-ex/0410027
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 105; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Exchange currents in nucleon electroexcitation journal August 2001
Implications of the discrepancy between proton form factor measurements journal February 2004
Measurements of electron-proton elastic cross sections for 0.4 < Q 2 < 5.5 ( GeV ∕ c ) 2 journal July 2004
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Accuracy of traditional Legendre estimators of quadrupole ratios for the N → Δ transition journal October 2005
Publisher's Note: Accuracy of traditional Legendre estimators of quadrupole ratios for theN→Δtransition [Phys. Rev. C 72, 048201 (2005)] journal November 2005
Experimental constraints on nonlinearities induced by two-photon effects in elastic and inelastic Rosenbluth separations journal February 2006
Low- Q scaling, duality, and the EMC effect journal March 2006
Recoil polarization measurements for neutral pion electroproduction at Q 2 = 1 ( GeV / c ) 2 near the Δ resonance journal February 2007
Electroproduction of η mesons in the S 11 ( 1535 ) resonance region at high momentum transfer journal July 2009
Applications of quark-hadron duality in the F 2 structure function journal September 2009
Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction journal November 2009
Empirical fit to precision inclusive electron-proton cross sections in the resonance region journal May 2010
Measurements of the separated longitudinal structure function F L from hydrogen and deuterium targets at low Q 2 journal April 2018
Freedom at moderate energies: Masses in color dynamics journal October 1976
Experimental studies of the neutron and proton electromagnetic structure functions journal October 1979
D waves in the nucleon: A test of color magnetism journal May 1982
Electroproduction of the Roper resonance as a hybrid state journal July 1992
Measurement of kinematic and nuclear dependence of R = σ L σ T in deep inelastic electron scattering journal June 1994
Measurements of the Δ ( 1232 ) transition form factor and the ratio σ n / σ p from inelastic electron-proton and electron-deuteron scattering journal June 1998
Parton distributions from deep-inelastic-scattering data journal July 2003
Parton-hadron duality in unpolarized and polarized structure functions journal January 2004
High-Energy Electroproduction and the Constitution of the Electric Current journal January 1969
Precocious Scaling, Rescaling, and ξ Scaling journal May 1976
Precocious Scaling, Rescaling, and ξ Scaling. journal July 1976
Electroproduction of the Δ ( 1232 ) Resonance at High Momentum Transfer journal January 1999
Pion Cloud and the Q 2 Dependence of γ * N ↔ Δ Transition Form Factors journal November 1999
Evidence for Valencelike Quark-Hadron Duality journal August 2000
Experimental Verification of Quark-Hadron Duality journal August 2000
Q 2 Dependence of Quadrupole Strength in the γ * p → Δ + ( 1232 ) → p π 0 Transition journal March 2002
Diquarks and Exotic Spectroscopy journal December 2003
Investigation of the Conjectured Nucleon Deformation at Low Momentum Transfer journal January 2005
Longitudinal-Transverse Separations of Deep-Inelastic Structure Functions at Low Q 2 for Hydrogen and Deuterium journal April 2007
Unitary isobar model --MAID2007 journal October 2007
Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction journal June 2013

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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