Discrete symmetries tested at 10−4 precision using linear polarization of photons from positronium annihilations

Paweł Moskal, Eryk Czerwiński (), Juhi Raj, Steven D. Bass, Ermias Y. Beyene, Neha Chug, Aurélien Coussat, Catalina Curceanu, Meysam Dadgar, Manish Das, Kamil Dulski, Aleksander Gajos, Marek Gorgol, Beatrix C. Hiesmayr, Bożena Jasińska, Krzysztof Kacprzak, Tevfik Kaplanoglu, Łukasz Kapłon, Konrad Klimaszewski, Paweł Konieczka, Grzegorz Korcyl, Tomasz Kozik, Wojciech Krzemień, Deepak Kumar, Simbarashe Moyo, Wiktor Mryka, Szymon Niedźwiecki, Szymon Parzych, Elena Pérez Río, Lech Raczyński, Sushil Sharma, Shivani Choudhary, Roman Y. Shopa, Michał Silarski, Magdalena Skurzok, Ewa Ł. Stępień, Pooja Tanty, Faranak Tayefi Ardebili, Keyvan Tayefi Ardebili, Kavya Valsan Eliyan and Wojciech Wiślicki
Additional contact information
Paweł Moskal: Jagiellonian University
Eryk Czerwiński: Jagiellonian University
Juhi Raj: Jagiellonian University
Steven D. Bass: Jagiellonian University
Ermias Y. Beyene: Jagiellonian University
Neha Chug: Jagiellonian University
Aurélien Coussat: Jagiellonian University
Catalina Curceanu: Laboratori Nazionali di Frascati
Meysam Dadgar: Jagiellonian University
Manish Das: Jagiellonian University
Kamil Dulski: Jagiellonian University
Aleksander Gajos: Jagiellonian University
Marek Gorgol: Maria Curie-Skłodowska University
Beatrix C. Hiesmayr: University of Vienna
Bożena Jasińska: Maria Curie-Skłodowska University
Krzysztof Kacprzak: Jagiellonian University
Tevfik Kaplanoglu: Jagiellonian University
Łukasz Kapłon: Jagiellonian University
Konrad Klimaszewski: National Centre for Nuclear Research
Paweł Konieczka: National Centre for Nuclear Research
Grzegorz Korcyl: Jagiellonian University
Tomasz Kozik: Jagiellonian University
Wojciech Krzemień: National Centre for Nuclear Research
Deepak Kumar: Jagiellonian University
Simbarashe Moyo: Jagiellonian University
Wiktor Mryka: Jagiellonian University
Szymon Niedźwiecki: Jagiellonian University
Szymon Parzych: Jagiellonian University
Elena Pérez Río: Jagiellonian University
Lech Raczyński: National Centre for Nuclear Research
Sushil Sharma: Jagiellonian University
Shivani Choudhary: Jagiellonian University
Roman Y. Shopa: National Centre for Nuclear Research
Michał Silarski: Jagiellonian University
Magdalena Skurzok: Jagiellonian University
Ewa Ł. Stępień: Jagiellonian University
Pooja Tanty: Jagiellonian University
Faranak Tayefi Ardebili: Jagiellonian University
Keyvan Tayefi Ardebili: Jagiellonian University
Kavya Valsan Eliyan: Jagiellonian University
Wojciech Wiślicki: National Centre for Nuclear Research

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Discrete symmetries play an important role in particle physics with violation of CP connected to the matter-antimatter imbalance in the Universe. We report the most precise test of P, T and CP invariance in decays of ortho-positronium, performed with methodology involving polarization of photons from these decays. Positronium, the simplest bound state of an electron and positron, is of recent interest with discrepancies reported between measured hyperfine energy structure and theory at the level of 10−4 signaling a need for better understanding of the positronium system at this level. We test discrete symmetries using photon polarizations determined via Compton scattering in the dedicated J-PET tomograph on an event-by-event basis and without the need to control the spin of the positronium with an external magnetic field, in contrast to previous experiments. Our result is consistent with QED expectations at the level of 0.0007 and one standard deviation.

Date: 2024
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DOI: 10.1038/s41467-023-44340-6

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