Analysis of the triplet production by the circularly polarized photon at high energies

TL;DR

This paper investigates how measuring electron polarization in triplet photoproduction at high energies can determine the circular polarization of photons, offering a potentially efficient experimental method.

Contribution

It introduces a novel approach to measure photon circular polarization through electron polarization in triplet production, with detailed analysis and experimental setup proposals.

Findings

Event number remains stable with increasing photon energy.

Distributions of created electrons can probe photon polarization.

Numerical estimations support experimental feasibility.

Abstract

The possibility in principle of the determining high energy photon circular polarization by the measurement of the created electron polarization in the process of triplet photoproduction $\gamma +e^-\rightarrow e^+e^- +e^-$ is investigated. The respective event number which depend on polarization states of photon and created electron does not decrease with the growth of the photon energy, and this circumstance can ensure the high efficiency in such kind of experiments. We study different double and single distributions of the created electron (or positron), which allow to probe the photon circular polarization and to measure its magnitude (the Stock's parameter $\xi_2$), using the technique of the Sudakov's variables. Some experimental setups with different rules for event selection are studied and corresponding numerical estimations are presented.