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Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering

Androić, D. and Liu, J. and McKeown, R. D. (2011) Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering. Physical Review Letters, 107 (1). Art. No. 022501. ISSN 0031-9007. https://resolver.caltech.edu/CaltechAUTHORS:20110725-083526378

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Abstract

We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasielastic scattering on the deuteron, at backward angles (lab scattering angle of 108°) for Q^2=0.22  GeV^2/c^2 and 0.63  GeV^2/c^2 at beam energies of 362 and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single-photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (πN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasistatic deuterium approximation, and is also in agreement with theory.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.107.022501DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevLett.107.022501PublisherUNSPECIFIED
http://prl.aps.org/abstract/PRL/v107/i2/e022501PublisherUNSPECIFIED
Additional Information:© 2011 American Physical Society. Received 24 March 2011; published 5 July 2011. We gratefully acknowledge the strong technical contributions to this experiment from many groups: Caltech, Illinois, LPSC-Grenoble, IPN-Orsay, TRIUMF, and particularly the Accelerator and Hall C groups at Jefferson Lab. CNRS (France), DOE (U.S.), NSERC (Canada), and NSF (U.S.) supported this work in part.
Funders:
Funding AgencyGrant Number
Centre National de la Recherche Scientifique (CNRS) (France)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
NSF UNSPECIFIED
Issue or Number:1
Classification Code:PACS: 25.30.Bf, 13.40.-f, 14.20.Dh, 24.70.+s
Record Number:CaltechAUTHORS:20110725-083526378
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110725-083526378
Official Citation:Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering D. Androić et al. (G0 Collaboration) Published 5 July 2011 (5 pages) 022501
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24516
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:25 Jul 2011 15:55
Last Modified:03 Oct 2019 02:57

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