Prediction of e± elastic scattering cross-section ratio based on phenomenological two-photon exchange corrections PREDICTION of e± ELASTIC SCATTERING CROSS- ⋯ I. A. QATTAN

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Abstract

I present a prediction of the e± elastic scattering cross-section ratio, Re+e-, as determined using a new parametrization of the two-photon exchange (TPE) corrections to electron-proton elastic scattering cross section σR. The extracted ratio is compared to several previous phenomenological extractions, TPE hadronic calculations, and direct measurements from the comparison of electron and positron scattering. The TPE corrections and the ratio Re+e- show a clear change of sign at low Q2, which is necessary to explain the high-Q2 form factors discrepancy while being consistent with the known Q2→0 limit. While my predictions are in generally good agreement with previous extractions, TPE hadronic calculations, and existing world data including the recent two measurements from the CLAS and VEPP-3 Novosibirsk experiments, they are larger than the new OLYMPUS measurements at larger Q2 values.

Original languageBritish English
Article number065208
JournalPhysical Review C
Volume95
Issue number6
DOIs
StatePublished - 14 Jun 2017

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