Measurement of the Electric and Magnetic Polarizabilities of the Proton

Abstract

The Compton scattering cross section on the proton has been measured at laboratory angles of 90${}^{\circ }$ and 135${}^{\circ }$ using tagged photons in the energy range 70--100 MeV and simultaneously using untagged photons in the range 100--148~MeV. With the aid of dispersion relations, these cross sections were used to extract the electric and magnetic polarizabilities, $\bar{\alpha }$ and $\bar{\beta }$ respectively, of the proton. We find $$\bar{\alpha }+\bar{\beta }=(15.0\pm 2.9\pm 1.1\pm 0.4)\times 10^{-4}{\mathrm{fm}}^3,$$ in agreement with a model-independent dispersion sum rule, and $$\bar{\alpha }-\bar{\beta }=(10.8\pm 1.1\pm 1.4\pm 1.0)\times 10^{-4}{\mathrm{fm}}^3,$$ where the errors shown are statistical, systematic, and model-dependent, respectively. A comparison with previous experiments is given and global values for the polarizabilities are extracted.

35 pages, 11 PostScript figures, uses RevTex 3.0

References in corpus (4)

• On the pion-nucleon coupling constant
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• Aspects of Nucleon Compton Scattering
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• First Extraction of a Spin-Polarizability of the Proton
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• Quasi-free Compton Scattering from the Deuteron and Nucleon Polarizabilities
• Nucleon Polarisabilities from Compton Scattering on the Deuteron
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