Polarization phenomena in elastic $e^{\mp }N$ scattering, for axial parametrization of two-photon exchange

Abstract

We analyze polarization phenomena for elastic lepton-nucleon scattering, parametrizing the $2\gamma$-exchange contribution, as the product of lepton and nucleon axial vector currents, that correspond to $C=+1$ exchange in the annihilation channel. We found two combinations of polarization observables (one for three T-odd observables and another one - for five T-even observables), which allow to measure the ratio $G_E(Q^2)/G_M(Q^2)$ of nucleon electromagnetic form factors in model independent way, without any specific assumption about the $2\gamma$-exchange mechanism. Both these combinations have a general character and do not depend on the choice of the spin structure for the $2\gamma$-exchange. We show the inconsistency of other approximations recently used in the literature.

Eight pages, no figures

References in corpus (3)

• Two-photon exchange and elastic electron-proton scattering
• How to reconcile the Rosenbluth and the polarization transfer method in the measurement of the proton form factors
• The complete experiment for $e^{\mp }N$ elastic scattering in presence of two-photon exchange

Cited by in corpus (25)

• Two-photon exchange in elastic electron-nucleon scattering
• Review of two-photon exchange in electron scattering
• Measurement of the Transverse Beam Spin Asymmetry in Elastic Electron Proton Scattering and the Inelastic Contribution to the Imaginary Part of the Two-Photon Exchange Amplitude
• Model independent properties of two-photon exchange in elastic electron proton scattering
• Search for evidence of two photon contribution in elastic electron proton data
• General analysis of polarization phenomena in $e^{+}+e^{-}\to N+\bar{N}$ for axial parametrization of two--photon exchange
• Feasibility studies of the time-like proton electromagnetic form factor measurements with PANDA at FAIR
• Polarization effects in the reaction $\bar{p}+p\to e^{+}+e^{-}$ in presence of two-photon exchange
• Comparison of Neural Network and Hadronic Model Predictions of Two-Photon Exchange Effect
• Two-Photon Exchange Contribution to Proton Form Factors in Time-Like region
• Model independent analysis of polarization effects in elastic electron deuteron scattering in presence of two--photon exchange
• Search for two photon exchange from $e^{+}+e^{-}\to p+\bar{p}+\gamma$ data
• Charge asymmetry for electron (positron)-proton elastic scattering at large angle
• On radiative corrections for unpolarized electron proton elastic scattering
• Model independent study of massive lepton elastic scattering on the proton, beyond the Born approximation
• Updated analysis of recent results on electron and positron elastic scattering on proton
• Form factor ratio from unpolarized elastic electron proton scattering
• The two photon exchange amplitude in $ep$ and $e\mu$ elastic scattering: a comparison
• Two-photon exchange: myth and history
• General analysis of two--photon exchange in elastic electron--${}^{4}He$ scattering and $e^{+}+e^{-}\to {\pi }^{+}+{\pi }^{-}.$
• Physics perspectives at JLab with a polarized positron beam
• Radiative corrections in nucleon time-like form factors measurements
• Radiative corrections in proton--antiproton annihilation to electron-positron and their application to the PANDA experiment
• Axial meson contribution to proton form factors
• From theory to experiment: hadron electromagnetic form factors in space-like and time-like regions