J-PET Monte Carlo Simulations for Time-Reversal Symmetry Test in Ortho-Positronium Decay

Abstract

This article reports the development of Monte Carlo simulations of the J-PET detector using the Geant4 toolkit aimed at serving as a foundation for testing the time-reversal symmetry in the decay of ortho-Positronium (o-Ps) atoms. In order to observe asymmetries in time-reversal, it is important to understand the physical properties of the signal candidates (o-Ps → 3γ) recorded by the detector setup. The simulations aim at replicating the experimental procedure of producing meta-stable triplet states of positronium and testing the T-symmetry using symmetry-odd operators with the Jagiellonian-Positron Emission Tomograph (J-PET) detector.

Sensitivity of Discrete Symmetry Tests in the Positronium System with the J-PET Detector

“…Notably, neither of such correlations have been measured to date due to the incapability of the previous positronium experiments to measure photon polarization. Due to the detection principle based on Compton interaction, J-PET is the first detector able to provide a measurement of such angular correlations involving photon electromagnetic polarization [3,28] and experiments towards this end are already ongoing [51,52].…”