Hagelstein, F. (2018). Δ(1232)-Resonance in the Hydrogen Spectrum. Few-Body Systems, 59(5) Springer 10.1007/s00601-018-1403-x
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Hagelstein2018_Article_VarvecVarDelta1232-ResonanceI.pdf - Published Version Available under License Publisher holds Copyright. Download (817kB) | Preview |
The electromagnetic excitation of the Δ(1232)-resonance plays an appreciable role in the Lamb shift and hyperfine structure of muonic and electronic hydrogen. Its effect appears at the subleading order O(α5), together with other proton-polarizability contributions from forward two-photon exchange. We use the large-Nc relations for the nucleon-to-delta transition form factors to compute the effect of the Δ(1232) in the hydrogen spectrum. We pay particular attention to a subtile difference between predictions based on a direct calculation of the two-photon exchange (or Compton scattering amplitudes) (Faustov et al. in Phys At Nucl 62:2099, 1999) and predictions based on the Δ(1232)-production photoabsorption cross sections (Buchmann in Can J Phys 87:773–783, 2009). The mismatch is explained by studying the dispersion relations for tree-level Compton scattering off the proton in more details.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 08 Faculty of Science > Institute of Theoretical Physics |
UniBE Contributor: |
Hagelstein, Franziska Elfriede |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0177-7963 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
Esther Fiechter |
Date Deposited: |
30 Aug 2018 14:50 |
Last Modified: |
05 Dec 2022 15:17 |
Publisher DOI: |
10.1007/s00601-018-1403-x |
ArXiv ID: |
1801.09790 |
BORIS DOI: |
10.7892/boris.119659 |
URI: |
https://boris.unibe.ch/id/eprint/119659 |
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