Testing Discrete Symmetries in Ortho-Positronium Decays with the J-PET Detector

TL;DR

This paper reports initial results from using the J-PET detector to test discrete symmetries, specifically CPT and CP, in ortho-positronium decays by analyzing angular correlations of gamma rays.

Contribution

It presents the first CPT test results with the J-PET detector and discusses potential for future CPT symmetry tests within the Standard-Model Extension framework.

Findings

Initial CPT test results obtained

Ongoing investigation of CP symmetry

Potential for Standard-Model Extension tests

Abstract

A first result related to a CPT test in the decay of ortho-positronium based on data collected by means of the J-PET detector is already available, and a new test of CP symmetry is under investigation. Both results are based on the determination of angular correlations between momenta of gamma rays and other vector properties of the investigated system. Here, arguments for the possible usage of data collected by the J-PET group to test CPT symmetry within the Standard-Model Extension framework are shortly presented.