New Prediction of the Positron-Proton to Electron-Proton Elastic Scattering Ratio $R_{e^+e^-}$ from ep Elastic Scattering Data

Qattan, I.A.

doi:10.1007/978-981-96-0191-2_13

New Prediction of the Positron-Proton to Electron-Proton Elastic Scattering Ratio $R_{e^+e^-}$ from ep Elastic Scattering Data

I.A. Qattan
(
- United Arab Emirates U.
)

2024

8 pages

Contribution to:

15th Asia Pacific Physics Conference, 133-140

Published: 2024

DOI:

10.1007/978-981-96-0191-2_13

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Abstract: (Springer)

I present a new extraction of the positron-proton to electron-proton elastic scattering cross sections ratio

R_{e^+e^-}(\varepsilon ,Q^2)

. Contrary to several previous phenomenological studies and extractions, which predicted the ratio

R_{e^+e^-}

using model-independent parametrization of

F(\varepsilon ,Q^2)

, the hard two-photon exchange (TPE) correction to the electron-proton (ep) elastic scattering cross section

\sigma _R

, I do not assume prior knowledge of the functional form of

F(\varepsilon ,Q^2)

, but rather I use combined unpolarized, and polarized ep elastic scattering experimental data to extract the TPE contributions to

\sigma _R

, and provide a simple parametrization of

F(\varepsilon ,Q^2)

along with the uncertainties associated with the model dependence of the extractions. I use the new parametrization of

F(\varepsilon ,Q^2)

to predict the ratio

R_{e^+e^-}

, and then compare my extractions of

R_{e^+e^-}

to several previous phenomenological extractions, TPE-hadronic calculations, and world data emphasizing mainly the kinematics range of the recent precise direct measurements from the OLYMPUS, VEPP-3, and CLAS experiments.

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Figures(0)

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New Prediction of the Positron-Proton to Electron-Proton Elastic Scattering Ratio Re+e−R_{e^+e^-}Re+e−​ from ep Elastic Scattering Data

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New Prediction of the Positron-Proton to Electron-Proton Elastic Scattering Ratio $R_{e^+e^-}$ from ep Elastic Scattering Data