PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T08 Flavour Physics and CP Violation
Exploring the limits of CPT symmetry in ortho-positronium decays with J-PET
N. Chug*  on behalf of the J-PET Collaboration
Full text: pdf
Pre-published on: February 14, 2024
Published on: March 21, 2024
The CPT symmetry is one of the most fundamental symmetries in physics. Any violation of this symmetry would have profound implications for our understanding of the universe. In this study, we report the CPT symmetry tests in 3$\gamma$ decays of polarised $^3$S$_{1}$ positronium using the Jagiellonian Positron Emission Tomography device. The J-PET experiment allows sensitive and precise tests of CPT symmetry by measuring the angular correlation between the spin of ortho-positronium and the momenta direction of the annihilation photons emitted in ortho-positronium decay. The potential of J-PET in determining the full range of the expectation value of this correlation has improved the precision of the CPT symmetry test to 10$^{-4}$ already. The accuracy of this previous measurement was limited by statistics only. The new test is based on the increased statistics due to the modified experimental setup aiming at the improvement of detection efficiency and due to the usage of different positronium production chambers. The high precision of this test would open the possibility of exploring the limits of CPT symmetry validity in the charged leptonic sector. In this work, we discuss the evaluation of background sources in the CPT symmetry test with J-PET which is a crucial factor in improving the precision of such studies.
DOI: https://doi.org/10.22323/1.449.0366
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.