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Title: Proton elastic form factor ratios to Q{sup 2}=3.5 GeV{sup 2} by polarization transfer

Abstract

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.

Authors:
 [1]; ; ; ; ; ;  [2]; ; ;  [3]; ;  [4]; ; ; ; ; ;  [5]; ;  [6]
  1. Norfolk State University, Norfolk, Virginia 23504 (United States)
  2. College of William and Mary, Williamsburg, Virginia 23187 (United States)
  3. California State University, Los Angeles, Los Angeles, California 90032 (United States)
  4. University of Georgia, Athens, Georgia 30602 (United States)
  5. Universite Blaise Pascal/CNRS-IN2P3, F-63177 Aubiere (France)
  6. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); and others
Publication Date:
OSTI Identifier:
20698695
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 71; Journal 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; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DISTRIBUTION; ELECTROMAGNETIC FORM FACTORS; ELECTRON REACTIONS; ELECTRON-PROTON INTERACTIONS; ELECTRONS; FOUR MOMENTUM TRANSFER; MAGNETIZATION; PHOTONS; POLARIZATION; PROTONS; RECOILS

Citation Formats

Punjabi, V, Perdrisat, C F, Gerstner, G, Pentchev, L, Rutledge, G, Strauch, S, Wijesooriya, K, Aniol, K A, Epstein, M B, Margaziotis, D J, Baker, F T, Templon, J A, Berthot, J, Bertin, P Y, Besson, A, Fonvieille, H, Jaminion, S, Laveissiere, G, Bertozzi, W, and Chai, Z. Proton elastic form factor ratios to Q{sup 2}=3.5 GeV{sup 2} by polarization transfer. United States: N. p., 2005. Web. doi:10.1103/PhysRevC.71.055202.
Punjabi, V, Perdrisat, C F, Gerstner, G, Pentchev, L, Rutledge, G, Strauch, S, Wijesooriya, K, Aniol, K A, Epstein, M B, Margaziotis, D J, Baker, F T, Templon, J A, Berthot, J, Bertin, P Y, Besson, A, Fonvieille, H, Jaminion, S, Laveissiere, G, Bertozzi, W, & Chai, Z. Proton elastic form factor ratios to Q{sup 2}=3.5 GeV{sup 2} by polarization transfer. United States. https://doi.org/10.1103/PhysRevC.71.055202
Punjabi, V, Perdrisat, C F, Gerstner, G, Pentchev, L, Rutledge, G, Strauch, S, Wijesooriya, K, Aniol, K A, Epstein, M B, Margaziotis, D J, Baker, F T, Templon, J A, Berthot, J, Bertin, P Y, Besson, A, Fonvieille, H, Jaminion, S, Laveissiere, G, Bertozzi, W, and Chai, Z. 2005. "Proton elastic form factor ratios to Q{sup 2}=3.5 GeV{sup 2} by polarization transfer". United States. https://doi.org/10.1103/PhysRevC.71.055202.
@article{osti_20698695,
title = {Proton elastic form factor ratios to Q{sup 2}=3.5 GeV{sup 2} by polarization transfer},
author = {Punjabi, V and Perdrisat, C F and Gerstner, G and Pentchev, L and Rutledge, G and Strauch, S and Wijesooriya, K and Aniol, K A and Epstein, M B and Margaziotis, D J and Baker, F T and Templon, J A and Berthot, J and Bertin, P Y and Besson, A and Fonvieille, H and Jaminion, S and Laveissiere, G and Bertozzi, W and Chai, Z},
abstractNote = {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.},
doi = {10.1103/PhysRevC.71.055202},
url = {https://www.osti.gov/biblio/20698695}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 5,
volume = 71,
place = {United States},
year = {Sun May 01 00:00:00 EDT 2005},
month = {Sun May 01 00:00:00 EDT 2005}
}