Journal
PHYSICAL REVIEW D
Volume 96, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.096001
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Funding
- Deutsche Forschungsgemeinschaft DFG in part through the Collaborative Research Center [Low-Energy Frontier of the Standard Model] [SFB 1044]
- Cluster of Excellence [Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA)]
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We evaluate the two-photon exchange correction to the elastic electron-proton scattering cross section within a dispersive framework. Besides the elastic contribution, we account for all pN intermediate state contributions using the phenomenological MAID fit as an input. We develop a novel method for the analytical continuation of the two-photon exchange amplitudes into the unphysical region and generalize our previous work to the momentum transfer region 0.064 GeV2 less than or similar to Q(2) less than or similar to 1 GeV2. We compare our results with recent OLYMPUS, CLAS and VEPP-3 data as well as with empirical fits and estimates in the forward angular region.
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