Proton Polarization Shifts in Electronic and Muonic Hydrogen

Details Proton Polarization Shifts in Electronic and Muonic Hydrogen Proton Polarization Shifts in Electronic and Muonic Hydrogen

1999-03-15

arxiv.org/abs/hep-ph/9903352v2

Phys.Lett. B463 (1999) 317-322

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LATEX, no figures, discussion improved and references updated, final version accepted for publication in Phys. Lett.

Scientific paper

10.1016/S0370-2693(99)00937-5

The contribution of virtual excitations to the energy levels of electronic and muonic hydrogen is investigated combining a model-independent approach for the main part with quark model predictions for the remaining corrections. Precise values for the polarization shifts are obtained in the long-wavelength dipole approximation by numerically integrating over measured total photoabsorption cross sections. These unretarded results are considerably reduced by including retardation effects in an approximate way since the average momentum transfer (together with the mean excitation energy) turns out to be larger than usually assumed. Transverse and seagull contributions are estimated in a simple harmonic oscillator quark model and found to be non-negligible. Possible uncertainties and improvements of the final results are discussed.

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