Two-photon exchange contribution to elastic e − -proton scattering: Full dispersive treatment of π N states and comparison with data

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 πN intermediate state contributions using the phenomenological MAID fit as an input. We develop a novel method fo...

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Bibliographic Details
Published in:Physical review. D 2017-11, Vol.96 (9), Article 096001
Main Authors: Tomalak, Oleksandr, Pasquini, Barbara, Vanderhaeghen, Marc
Format: Article
Language:English
Subjects:
Dispersion
Elastic scattering
Empirical analysis
Exchanging
Momentum transfer
Proton scattering
Scattering cross sections
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Summary: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 πN 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≲Q2≲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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.96.096001