Effects of excited electron and contact $ee\gamma\gamma $ interaction in $ e^+e^-\rightarrow \gamma\gamma $ reaction

TL;DR

This paper investigates how excited electrons and contact interactions influence the $e^+e^- o \gamma\gamma$ process, providing calculations for cross sections, polarization observables, and asymmetries relevant for high-energy collider experiments.

Contribution

It introduces a detailed analysis of excited electron effects and contact interactions on photon pair production, including polarization and asymmetry calculations, which are novel in this context.

Findings

Excited electron contributions significantly alter differential cross sections.

Polarization observables are sensitive to excited electron parameters.

Numerical estimates show measurable effects at certain energies and masses.

Abstract

The differential cross section and some polarization observables have been calculated for the $e^+\,e^-\to \gamma\,\gamma$ reaction taking into account the contribution of the heavy excited electron and the general form $e\,e\,\gamma\,\gamma$ contact interaction. The spin correlation coefficients are calculated for the case when both beams have arbitrary polarization. The so called left-right asymmetry is estimated if only one beam is polarized. Numerical estimations are given for the excited electron contribution to the differential cross section and spin correlation coefficients for various values of the electron beam energy and excited electron mass.