Search for Effects Beyond the Born Approximation in Polarization Transfer Observables in e⃗p Elastic Scattering
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Meziane-2011-Search for Effects B.pdf
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Author(s)
Puckett, Andrew James R.
Gilad, Shalev
Huang, J.
Bertozzi, William
Date Issued
March 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Meziane, M. et al. “Search for Effects Beyond the Born Approximation in Polarization Transfer Observables in e[over →]p Elastic Scattering.” Physical Review Letters 106 (2011): n. pag. Web. 21 Oct. 2011. © 2011 American Physical Society
Version
Final published version
Abstract
Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, G[subscript E]/G[subscript M], obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic H(e⃗,e′p⃗) reaction for three different beam energies at a Q[supersccript 2]=2.5 GeV[superscript 2], spanning a wide range of the kinematic parameter ϵ. The ratio R, which equals μ[subscript p]G[subscript E]/G[subscript M] in the Born approximation, is found to be independent of ϵ at the 1.5% level. The ϵ dependence of the longitudinal polarization transfer component P[subscript ℓ] shows an enhancement of (2.3±0.6)% relative to the Born approximation at large ϵ.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.106.132501
