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

Journal Article · Fri Aug 31 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.092301· OSTI ID:21028175

Armstrong, D S; Averett, T; Bailey, S L; Finn, J M; Griffioen, K A; Moffit, B; Phillips, S K; Secrest, J; Sulkosky, V ^[1]; Arvieux, J; Bimbot, L; Guler, H; Lenoble, J; Marchand, D; Morlet, M; Ong, S; Van de Wiele, J ^[2]; Asaturyan, R; Mkrtchyan, H; Stepanyan, S ^[3]

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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)

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.

• OSTI ID: 21028175
• Journal Information: Physical Review Letters, Vol. 99, Issue 9; Other Information: DOI: 10.1103/PhysRevLett.99.092301; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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