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Title: Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering

Abstract

We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q{sup 2}=0.15, 0.25 (GeV/c){sup 2}. The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A{sub n} provides a direct probe of the imaginary component of the 2{gamma} exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.

Authors:
; ; ; ; ; ; ; ;  [1]; ; ; ; ; ; ; ;  [2]; ; ;  [3]
  1. Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States)
  2. Institut de Physique Nucleaire d'Orsay, CNRS/IN2P3, Universite Paris Sud, Orsay (France)
  3. Yerevan Physics Institute, Yerevan 375036 (Armenia)
Publication Date:
OSTI Identifier:
21028175
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 99; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevLett.99.092301; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; ELASTIC SCATTERING; ELECTRON BEAMS; ELECTRON-PROTON INTERACTIONS; ELECTRONS; GEV RANGE 01-10; INTERMEDIATE STATE; PROTON BEAMS; PROTONS; SPIN

Citation Formats

Armstrong, D S, Averett, T, Bailey, S L, Finn, J M, Griffioen, K A, Moffit, B, Phillips, S K, Secrest, J, Sulkosky, V, Arvieux, J, Bimbot, L, Guler, H, Lenoble, J, Marchand, D, Morlet, M, Ong, S, Van de Wiele, J, Asaturyan, R, Mkrtchyan, H, and Stepanyan, S. Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.99.092301.
Armstrong, D S, Averett, T, Bailey, S L, Finn, J M, Griffioen, K A, Moffit, B, Phillips, S K, Secrest, J, Sulkosky, V, Arvieux, J, Bimbot, L, Guler, H, Lenoble, J, Marchand, D, Morlet, M, Ong, S, Van de Wiele, J, Asaturyan, R, Mkrtchyan, H, & Stepanyan, S. Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering. United States. https://doi.org/10.1103/PHYSREVLETT.99.092301
Armstrong, D S, Averett, T, Bailey, S L, Finn, J M, Griffioen, K A, Moffit, B, Phillips, S K, Secrest, J, Sulkosky, V, Arvieux, J, Bimbot, L, Guler, H, Lenoble, J, Marchand, D, Morlet, M, Ong, S, Van de Wiele, J, Asaturyan, R, Mkrtchyan, H, and Stepanyan, S. 2007. "Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering". United States. https://doi.org/10.1103/PHYSREVLETT.99.092301.
@article{osti_21028175,
title = {Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering},
author = {Armstrong, D S and Averett, T and Bailey, S L and Finn, J M and Griffioen, K A and Moffit, B and Phillips, S K and Secrest, J and Sulkosky, V and Arvieux, J and Bimbot, L and Guler, H and Lenoble, J and Marchand, D and Morlet, M and Ong, S and Van de Wiele, J and Asaturyan, R and Mkrtchyan, H and Stepanyan, S},
abstractNote = {We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q{sup 2}=0.15, 0.25 (GeV/c){sup 2}. The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A{sub n} provides a direct probe of the imaginary component of the 2{gamma} exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.},
doi = {10.1103/PHYSREVLETT.99.092301},
url = {https://www.osti.gov/biblio/21028175}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 9,
volume = 99,
place = {United States},
year = {Fri Aug 31 00:00:00 EDT 2007},
month = {Fri Aug 31 00:00:00 EDT 2007}
}