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

P. Moskal (), A. Gajos (), M. Mohammed, J. Chhokar, N. Chug, C. Curceanu, E. Czerwiński, M. Dadgar, K. Dulski, M. Gorgol, J. Goworek, B. C. Hiesmayr, B. Jasińska, K. Kacprzak, Ł. Kapłon, H. Karimi, D. Kisielewska, K. Klimaszewski, G. Korcyl, P. Kowalski, N. Krawczyk, W. Krzemień, T. Kozik, E. Kubicz, S. Niedźwiecki, S. Parzych, M. Pawlik-Niedźwiecka, L. Raczyński, J. Raj, S. Sharma, S. Choudhary, R. Y. Shopa, A. Sienkiewicz, M. Silarski, M. Skurzok, E. Ł. Stępień, F. Tayefi and W. Wiślicki
Additional contact information
P. Moskal: Jagiellonian University
A. Gajos: Jagiellonian University
M. Mohammed: Jagiellonian University
J. Chhokar: Jagiellonian University
N. Chug: Jagiellonian University
C. Curceanu: Laboratori Nazionali di Frascati CP 13
E. Czerwiński: Jagiellonian University
M. Dadgar: Jagiellonian University
K. Dulski: Jagiellonian University
M. Gorgol: Maria Curie-Skłodowska University
J. Goworek: Maria Curie-Skłodowska University
B. C. Hiesmayr: University of Vienna Boltzmanngasse 5
B. Jasińska: Maria Curie-Skłodowska University
K. Kacprzak: Jagiellonian University
Ł. Kapłon: Jagiellonian University
H. Karimi: Jagiellonian University
D. Kisielewska: Jagiellonian University
K. Klimaszewski: National Centre for Nuclear Research
G. Korcyl: Jagiellonian University
P. Kowalski: National Centre for Nuclear Research
N. Krawczyk: Jagiellonian University
W. Krzemień: National Centre for Nuclear Research
T. Kozik: Jagiellonian University
E. Kubicz: Jagiellonian University
S. Niedźwiecki: Jagiellonian University
S. Parzych: Jagiellonian University
M. Pawlik-Niedźwiecka: Jagiellonian University
L. Raczyński: National Centre for Nuclear Research
J. Raj: Jagiellonian University
S. Sharma: Jagiellonian University
S. Choudhary: Jagiellonian University
R. Y. Shopa: National Centre for Nuclear Research
A. Sienkiewicz: Maria Curie-Skłodowska University
M. Silarski: Jagiellonian University
M. Skurzok: Jagiellonian University
E. Ł. Stępień: Jagiellonian University
F. Tayefi: Jagiellonian University
W. Wiślicki: National Centre for Nuclear Research

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-25905-9

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