Systematic Study of Positronium Production Medium in the J-PET Experiment for the CPT Symmetry Test |
| Neha Chuga, b, P. Moskala, b (on behalf of the J-PET Collaboration)
aFaculty of Physics, Astronomy, and Applied Computer Science, Jagiellonian University, ul. Łojasiewicza 11, 30-348 Kraków, Poland bCenter for Theranostics, Jagiellonian University, Kopernika 40, 31-501 Kraków, Poland |
| Full Text PDF |
| The Jagiellonian positron emission tomograph (J-PET) is a novel technology employed to detect multiple photons from positronium annihilation. It employs plastic scintillator strips optimized for the detection of photons in the sub-MeV energy range. The experimental setup consists of a positron-emitting source surrounded by chambers coated with porous materials to facilitate positronium formation. Owing to its large geometrical acceptance and high angular resolution, J-PET enables the reconstruction of various kinematic configurations of positronium annihilations, allowing for precise measurements of angular correlations in ortho-positronium decays. The detector has already demonstrated high sensitivity in charge-parity and charge-parity-time symmetry tests based on such correlations. In the present work, we report a systematic study of the effects of non-uniformity in porous materials used for positronium production in the J-PET setup, performed in the context of a charge-parity-time symmetry test. The systematic uncertainty obtained from this study is 0.59×10-5, and contributes negligibly to the total uncertainty of the charge-parity-time symmetry test. |
DOI:10.12693/APhysPolA.148.S119 topics: charge-parity-time (CPT) symmetry, positronium, uncertainty, Jagiellonian positron emission tomograph (J-PET) |