Proton elastic form factor ratios to Q{sup 2}=3.5 GeV{sup 2} by polarization transfer
- Norfolk State University, Norfolk, Virginia 23504 (United States)
- College of William and Mary, Williamsburg, Virginia 23187 (United States)
- California State University, Los Angeles, Los Angeles, California 90032 (United States)
- University of Georgia, Athens, Georgia 30602 (United States)
- Universite Blaise Pascal/CNRS-IN2P3, F-63177 Aubiere (France)
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); and others
The ratio of the proton elastic electromagnetic form factors, G{sub Ep}/G{sub Mp}, was obtained by measuring P{sub t} and P{sub l}, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic e{sup {yields}}p{yields}ep{sup {yields}}reaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV{sup 2}. In the single-photon exchange approximation, G{sub Ep}/G{sub Mp} is directly proportional to P{sub t}/P{sub l}. The simultaneous measurement of P{sub t} and P{sub l} in a polarimeter reduces systematic uncertainties. The results for G{sub Ep}/G{sub Mp} show a systematic decrease with increasing Q{sup 2}, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been reanalyzed and their systematic uncertainties have become significantly smaller than those reported previously.
- OSTI ID:
- 20698695
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 71, Issue 5; Other Information: DOI: 10.1103/PhysRevC.71.055202; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). Jefferson Lab Hall A Collaboration; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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