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Open AccessFeature PaperArticle

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

Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, S. Łojasiewicza 11, 30-348 Kraków, Poland
Symmetry 2020, 12(8), 1268; https://doi.org/10.3390/sym12081268
Received: 1 June 2020 / Revised: 24 June 2020 / Accepted: 2 July 2020 / Published: 1 August 2020
(This article belongs to the Special Issue Symmetry in Atomic, Nuclear and Particle Physics)
Study of certain angular correlations in the three-photon annihilations of the triplet state of positronium, the electron–positron bound state, may be used as a probe of potential CP and CPT-violating effects in the leptonic sector. We present the perspectives of CP and CPT tests using this process recorded with a novel detection system for photons in the positron annihilation energy range, the Jagiellonian Positron Emission Tomography (J-PET). We demonstrate the capability of this system to register three-photon annihilations with an unprecedented range of kinematical configurations and to measure the CPT-odd correlation between positronium spin and annihilation plane orientation with a precision improved by at least an order of magnitude with respect to present results. We also discuss the means to control and reduce detector asymmetries in order to allow J-PET to set the first measurement of the correlation between positronium spin and momentum of the most energetic annihilation photon which has never been studied to date. View Full-Text
Keywords: discrete symmetry; CPT; positronium discrete symmetry; CPT; positronium
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Gajos, A. Sensitivity of Discrete Symmetry Tests in the Positronium System with the J-PET Detector. Symmetry 2020, 12, 1268.

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