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 Duls… 展开作者
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 del 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, Wojciech Wiślicki
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.
Positronium energy levels at order $m α^7$: light-by-light scattering in the two-photon-annihilation channel
最近和正在进行的实验工作的正电子素光谱激励新的努力，计算正电子素能级的水平上的三个环路的修正。我们已经获得了一组这样的校正结果，涉及光的光散射的光子产生的双光子虚湮灭过程。我们的结果是能量移动$1.58377(8) m α^7/π^3$为n=1的单重态，校正基态超精细分裂-6.95 kHz。我们还得到了一个新的和更精确的结果的光-光散射修正的真实衰变的电子偶素到两个光子。
Ortho-Positronium Three-Photon Decays: Physics Constraints and a Closed-Form Energy Method for Annihilation Vertex Reconstruction
IT:U Interdisciplinary Transformation University（IT:U跨学科转型大学）；University of Vienna, Faculty of Physics（维也纳大学物理学院）；National Centre for Nuclear Research（国家核研究中心）；INSA-Lyon, Université Claude Bernard Lyon 1（里昂国立应用科学学院，克洛德·贝尔纳里昂大学）
Comments on the publication "Discrete symmetries tested at 10e-4 precision using linear polarization of photons from positronium annihilations" by P. Moskal et al
