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

Author:

Moskal PawełORCID,Czerwiński ErykORCID,Raj Juhi,Bass Steven D.,Beyene Ermias Y.,Chug Neha,Coussat Aurélien,Curceanu CatalinaORCID,Dadgar Meysam,Das ManishORCID,Dulski KamilORCID,Gajos Aleksander,Gorgol Marek,Hiesmayr Beatrix C.ORCID,Jasińska Bożena,Kacprzak Krzysztof,Kaplanoglu TevfikORCID,Kapłon ŁukaszORCID,Klimaszewski KonradORCID,Konieczka PawełORCID,Korcyl Grzegorz,Kozik Tomasz,Krzemień Wojciech,Kumar DeepakORCID,Moyo Simbarashe,Mryka WiktorORCID,Niedźwiecki SzymonORCID,Parzych Szymon,del Río Elena PérezORCID,Raczyński Lech,Sharma SushilORCID,Choudhary Shivani,Shopa Roman Y.,Silarski MichałORCID,Skurzok Magdalena,Stępień Ewa Ł.ORCID,Tanty Pooja,Ardebili Faranak Tayefi,Ardebili Keyvan TayefiORCID,Eliyan Kavya ValsanORCID,Wiślicki Wojciech

Abstract

AbstractDiscrete 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.

Funder

Fundacja na rzecz Nauki Polskiej

Narodowe Centrum Nauki

Ministerstwo Nauki i Szkolnictwa Wyższego

EC | Horizon 2020 Framework Programme

Austrian Science Fund

Publisher

Springer Science and Business Media LLC

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Experimental Uses of Positronium and Potential for Biological Applications;IEEE Transactions on Radiation and Plasma Medical Sciences;2024-07

2. Emphasizing Cherenkov Photons From Bismuth Germanate by Single Photon Response Deconvolution;IEEE Transactions on Radiation and Plasma Medical Sciences;2024-07

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