Low-energy γp scattering and determination of proton polarizabilities
Tóm tắt
For the first time, an analysis of all experimental data on the differential cross section for elastic γp scattering at photon energies below 150 MeV is performed in order to determine the electric (α
p) and magnetic (β
p) polarizabilities of the proton. A fit to these data with two free parameters α p and β
p embedded into the theoretical cross section obtained on the basis of finite-energy s-channel dispersion relations gives the following world-average values of the proton polarizabilities: α
p=11.7±0.8 (stat.+syst.)±0.7 (model), β
p=2.3±0.9 (stat.+syst.)±0.7 (model) in units of 10−4 fm3. The first error is combined—it takes into account the statistical and systematic errors in the experimental cross sections—while the second error comes from the theoretical uncertainties in the dispersion-theory cross sections.
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