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Title: The Proton Form Factor Ratio Measurements at Jefferson Lab

The ratio of the proton form factors, G{sub Ep}/G{sub Mp}, has been measured from Q{sup 2} of 0.5 GeV{sup 2} to 8.5 GeV{sup 2}, at the Jefferson Laboratory, using the polarization transfer method. This ratio is extracted directly from the measured ratio of the transverse and longitudinal polarization components of the recoiling proton in elastic electron-proton scattering. The discovery that the proton form factor ratio measured in these experiments decreases approximately linearly with four-momentum transfer, Q{sup 2}, for values above ~1 GeV{sup 2}, is one of the most significant results to come out of JLab. These results have had a large impact on progress in hadronic physics; and have required a significant rethinking of nucleon structure. The increasingly common use of the double-polarization technique to measure the nucleon form factors, in the last 15 years, has resulted in a dramatic improvement of the quality of all four nucleon electromagnetic form factors, G{sub Ep}, G{sub Mp}, G{sub En} and G{sub Mn}. There is an approved experiment at JLab, GEP(V), to continue the ratio measurements to 12 GeV{sup 2}. A dedicated experimental setup, the Super Bigbite Spectrometer (SBS), will be built for this purpose. It will be equipped with a focal planemore » polarimeter to measure the polarization of the recoil protons. The scattered electrons will be detected in an electromagnetic calorimeter. In this presentation, I will review the status of the proton elastic electromagnetic form factors and discuss a number of theoretical approaches to describe nucleon form factors.« less
 [1] ;  [2]
  1. Norfolk State University, Norfolk, VA (United States)
  2. William and Mary College, Williamsburg, VA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-PHY--13-1710; DOE/OR/23177-2723; arXiv:1403.5504
National Science Foundation, PHY1066374; TRN: US1400267
DOE Contract Number:
AC05-06OR23177; FG02-89ER40525
Resource Type:
Resource Relation:
Journal Name: EPJ Web of Conferences; Journal Volume: 66; Conference: INPC 2013 - International Nuclear Physics Conference, Firenze (Italy) 2-7 Jun 2013
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC) (United States)
Country of Publication:
United States