Proton structure and hyperfine splitting in the hydrogen atom

Two-photon exchange contributions to elastic electron-scattering are reviewed. The apparent discrepancy in the extraction of elastic nucleon form factors between unpolarized Rosenbluth and polarization transfer experiments is discussed, as well as the understanding of this puzzle in terms of two-photon exchange corrections. Calculations of such corrections both within partonic and hadronic frameworks are reviewed. In view of recent spin-dependent electron scattering data, the relation of the two-photon exchange process to the hyperfine splitting in hydrogen is critically examined. The imaginary part of the two-photon exchange amplitude as can be accessed from the beam normal spin asymmetry in elastic electron-nucleon scattering is reviewed. Further extensions and open issues in this field are outlined.

show abstract

“…Integrating what can be integrated, and neglecting m e inside the integral, yields the expression [75,76,77,78,79,80] …”

Section: Hyperfine Splitting Calculationsmentioning

confidence: 99%

Two-Photon Physics in Hadronic Processes

Carlson

Vanderhaeghen

2007

Annu. Rev. Nucl. Part. Sci.

161

173

View full text Add to dashboard Cite

show abstract

“…1 is not a lone proton, we obtain inelastic contributions or polarizability contributions [12,13,14,15,16,17].The inelastic contributions are not calculable ab initio. Instead, one relates them to the amplitude for forward Compton scattering of off-shell photons off protons, given in terms of the matrix element…”

Section: Hyperfine Splitting Calculationsmentioning

confidence: 96%

New evaluation of proton structure corrections to hydrogen hyperfine splitting

Carlson

2007

Can. J. Phys.

View full text Add to dashboard Cite

Abstract:We consider the proton structure corrections to hydrogen ground-state hyperfine structure, focusing on a state-of-the-art evaluation of the inelastic nucleon corrections-the polarizability corrections-using analytic fits to the most recent data. We find a value for the fractional correction ∆ pol of 1.3 ± 0.3 ppm. This is 1-2 ppm smaller than the value of ∆ pol one would deduce using hyperfine splitting data and elastic proton structure corrections obtained from modern form factor fits. In addition, we discuss the derivations of the relevant formulas, paying attention to lepton mass effects and to questions surrounding the use of unsubtracted dispersion relations.

show abstract

“…For the record, and because there is some physics interest, we will display some of the formulas for the polarizability terms, originally found in [14,15,16,17]. The quantity itself is given by…”

Section: Polarizability Termsmentioning

confidence: 99%

Proton Structure and Atomic Physics

Carlson¹

2009

AIP Conference Proceedings

View full text Add to dashboard Cite

An ab initio study of the hyperfine structure in the X 2 Π electronic state of CCCH Phosphorus hyperfine structure in the electronic spectrum of the HPCl free radical Ab initio and molecular-dynamics studies on rare gas hydrides: Potential-energy curves, isotropic hyperfine properties, and matrix cage trapping of atomic hydrogen Abstract. We discuss a precise determination of the polarizability and other proton structure dependent contributions to the hydrogen hyperfine splitting, based heavily on the most recent published data on proton spin dependent structure functions from the EG1 experiment at the Jefferson Laboratory. As a result, the total calculated hyperfine splitting now has a standard deviation slightly under 1 part-per-million, and is about 1 standard deviation away from the measured value.

show abstract

Proton structure and hyperfine splitting in the hydrogen atom

Cited by 18 publications

References 6 publications

Two-Photon Physics in Hadronic Processes

Two-Photon Physics in Hadronic Processes

New evaluation of proton structure corrections to hydrogen hyperfine splitting

Proton Structure and Atomic Physics

Contact Info

Product

Resources

About