New extraction of the $R_{e^+e^-}$ elastic scattering cross-section ratio based on a simplified phenomenological hard two-photon-exchange correction approach - INSPIRE

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New extraction of the $R_{e^+e^-}$ elastic scattering cross-section ratio based on a simplified phenomenological hard two-photon-exchange correction approach

May 14, 2021

9 pages

Published in:

Phys.Rev.C 103 (2021) 5, 055202

Published: May 14, 2021

DOI:

10.1103/PhysRevC.103.055202

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Abstract: (APS)

In this work, we present a prediction of the positron-proton and electron-proton elastic scattering cross-section ratio Re+e− based on a new phenomenological parametrization of the hard two-photon-exchange (TPE) corrections to electron-proton elastic scattering cross section σR. The TPE parametrization proposed in this work is rather simple, as it only requires the use of suitable global fits of both the Rosenbluth magnetic G̃M, and the true magnetic GM form factors, or alternatively, the electric form factors G̃E and GE. We compare our results to recent extractions, and world's data on Re+e− with emphasis mainly on the kinematics range of the recent direct measurements from the CLAS, VEPP-3, and OLYMPUS experiments. With the proper choice of G̃M and GM parametrizations, and while our results are in generally good agreement with Re+e− measurements taken at high ɛ points and for all Q2 range, they agree remarkably well, within the error bands of the predictions, with Re+e− measurements taken at low-ɛ points for Q2=1.0 and 1.5(GeV/c)2, where emphasis should be placed for evidence of hard TPE correction. Finally, we believe that the assumption that hard TPE corrections could account for the discrepancy on the proton's form factors ratio μpGE/GM is still an open question as more measurements of Re+e− are clearly needed for Q2>2.1(GeV/c)2, in the region where the discrepancy is significant.

Hadronic Physics and QCD
cross section: elastic scattering
cross section: ratio
electron p: elastic scattering
positron p: elastic scattering
exchange: two-photon
p: form factor: ratio
p: form factor: electric
p: form factor: magnetic
parametrization

References(112)

Figures(0)

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