Testing CPT symmetry in ortho-positronium decays with positronium annihilation tomography

Autor: Moskal, Paweł, Gajos, Aleksander, Mohammed, Muhsin, Chhokar, Jyoti, Chug, Neha, Curceanu, Catalina, Czerwiński, Eryk, Dadgar, Meysam, Dulski, Kamil, Gorgol, Marek, Goworek, Jacek, Hiesmayr, Beatrix, Jasińska, Bożena, Kacprzak, Krzysztof, Kapłon, Łukasz, Karimi, Hanieh, Kisielewska, Daria, Klimaszewski, Konrad, Korcyl, Grzegorz, Kowalski, Paweł, Krawczyk, Nikodem, Krzemień, Wojciech, Kozik, Tomasz, Kubicz, Ewelina, Niedźwiecki, Szymon, Parzych, Szymon, Pawlik-Niedźwiecka, Monika, Raczyński, Lech, Raj, Juhi, Sharma, Sushil, Choudhary, Shivani, Shopa, Roman, Sienkiewicz, Andrzej, Silarski, Michał, Skurzok, Magdalena, Stępień, Ewa, Tayefi, Faranak, Wiślicki, Wojciech
Rok vydání: 2021
Předmět:
Zdroj: Nature Communications 12, 5658 (2021)
Druh dokumentu: Working Paper
DOI: 10.1038/s41467-021-25905-9
Popis: Charged lepton system symmetry under combined charge, parity, and time-reversal transformation (CPT) remains scarcely tested. Despite stringent quantum-electrodynamic limits, discrepancies in predictions for the electron-positron bound state (positronium atom) motivate further investigation, including fundamental symmetry tests. While CPT noninvariance effects could be manifested in non-vanishing angular correlations between final-state photons and spin of annihilating positronium, measurements were previously limited by knowledge of the latter. Here, we demonstrate tomographic reconstruction techniques applied to three-photon annihilations of ortho-positronium atoms to estimate their spin polarisation without magnetic field or polarised positronium source. We use a plastic-scintillator-based positron-emission-tomography scanner to record ortho-positronium (o-Ps) annihilations with single-event estimation of o-Ps spin and determine the complete spectrum of an angular correlation operator sensitive to CPT-violating effects. We find no violation at the precision level of 10^{-4}, with an over threefold improvement on the previous measurement.
Comment: This is a preprint of an article published in Nature Communications. The final version is available at https://rdcu.be/cCQqq
Databáze: arXiv
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