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

Abstract

Two-photon annihilate contributions in the process $e^{+}+e^{-}\to p+\bar{p}$ including $N$ and $\Delta$ intermediate are discussed in a simple hadronic model. The corrections to the unpolarized cross section and polarized observables $P_x,P_z$ are presented. The results show the two-photon annihilate correction to unpolarized cross section is small and its angle dependence becomes weak at small $s$ after considering the $N$ and $\Delta (1232)$ contributions simultaneously, while the correction to $P_z$ is enhanced.

5 pages

References in corpus (3)

• Two-Photon Exchange Contribution to Proton Form Factors in Time-Like region
• Search for two photon exchange from $e^{+}+e^{-}\to p+\bar{p}+\gamma$ data
• Polarization effects for the reaction $e^{+}+e^{-}\to \bar{p}+p$ in presence of two--photon exchange - Lecture Notes