Journal
PHYSICS LETTERS B
Volume 718, Issue 3, Pages 1078-1082Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2012.11.016
Keywords
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Funding
- United States Department of Energy [FG02-97ER41014]
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The uncertainty in the contribution to the Lamb shift in muonic hydrogen, Delta E-subt arising from proton polarizability effects in the two-photon exchange diagram at large virtual photon momenta is shown large enough to account for the proton radius puzzle. This is because Delta E-subt is determined by an integrand that falls very slowly with very large virtual photon momenta. We evaluate the necessary integral using a set of chosen form factors and also a dimensional regularization procedure which makes explicit the need for a low energy constant. The consequences of our two-photon exchange interaction for low-energy elastic lepton-proton scattering are evaluated and could be observable in a planned low energy lepton-proton scattering experiment planned to run at PSI. (C) 2012 Elsevier B.V. All rights reserved.
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