Two-Photon Exchange Contribution to Proton Form Factors in Time-Like region

Abstract

We estimate two-photon exchange contribution to the process $e^{+}+e^{-}\to p+\bar{p}$. The two-photon exchange corrections to double spin polarization observables and form factors in the time-like region are calculated. The corrections are found to be small in magnitude, but with a strong angular dependence at fixed momentum transfer. These two features are the same as those in the space-like region. In the view of experiment, the double spin polarization observable $P_z$ deserves to be considered.

10 pages, 6 figures

References in corpus (2)

• Two-photon exchange at low Q^2
• Search for two photon exchange from $e^{+}+e^{-}\to p+\bar{p}+\gamma$ data

Cited by in corpus (1)

• $\Delta$ contribution in $e^{+}+e^{-}\to p+\bar{p}$ at small $s$