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

被引：71

作者：

Moskal, P. ^{[1
,2
]}

Gajos, A. ^{[1
,2
]}

Mohammed, M. ^{[1
]}

Chhokar, J. ^{[1
,2
]}

Chug, N. ^{[1
,2
]}

Curceanu, C. ^{[3
]}

Czerwinski, E. ^{[1
,2
]}

Dadgar, M. ^{[1
,2
]}

Dulski, K. ^{[1
,2
]}

Gorgol, M. ^{[4
]}

Goworek, J. ^{[5
]}

Hiesmayr, B. C. ^{[6
]}

Jasinska, B. ^{[4
]}

Kacprzak, K. ^{[1
]}

Kaplon, L. ^{[1
,2
]}

Karimi, H. ^{[1
]}

Kisielewska, D. ^{[7
]}

Klimaszewski, K. ^{[1
,2
]}

Korcyl, G. ^{[7
]}

Kowalski, P. ^{[1
,2
]}

Krawczyk, N. ^{[8
]}

Krzemien, W. ^{[1
]}

Kozik, T. ^{[1
,2
]}

Kubicz, E. ^{[1
,2
]}

Niedzwiecki, S. ^{[1
,2
]}

Parzych, S. ^{[1
,2
]}

Pawlik-Niedzwiecka, M. ^{[1
,2
]}

Raczynski, L. ^{[7
]}

Raj, J. ^{[1
,2
]}

Sharma, S. ^{[1
,2
]}

Choudhary, S. ^{[1
,2
]}

Shopa, R. Y. ^{[7
]}

Sienkiewicz, A. ^{[5
]}

Silarski, M. ^{[1
,2
]}

Skurzok, M. ^{[1
,3
]}

Stepien, E. L. ^{[1
,2
]}

Tayefi, F. ^{[1
,2
]}

Wislicki, W. ^{[7
]}

机构：

[1] Jagiellonian Univ, Fac Phys Astron & Appl Comp Sci, S Lojasiewicza 11, PL-30348 Krakow, Poland

[2] Jagiellonian Univ, Total Body Jagiellonian PET Lab, Krakow, Poland

[3] Ist Nazl Fis Nucl, Lab Nazl Frascati CP 13, Via E Fermi, I-00044 Frascati, Italy

[4] Marie Curie Sklodowska Univ, Dept Nucl Methods, Inst Phys, Pl M Curie Sklodowskiej 1, PL-20031 Lublin, Poland

[5] Marie Curie Sklodowska Univ, Fac Chem, Inst Chem Sci, Pl M Curie Sklodowskiej 1, PL-20031 Lublin, Poland

[6] Univ Vienna, Fac Phys, Boltzmanngasse 5, A-1090 Vienna, Austria

[7] Natl Ctr Nucl Res, Dept Complex Syst, PL-05400 Otwock, Poland

[8] Natl Ctr Nucl Res, High Energy Dept, PL-05400 Otwock, Poland

来源：

NATURE COMMUNICATIONS | 2021年 / 12卷 / 01期

基金：

奥地利科学基金会;

关键词：

J-PET; 3; PHOTONS; INVARIANCE; SPIN;

D O I：

10.1038/s41467-021-25905-9

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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. CPT violation could manifest itself in annihilating positronium events, but searching for this effect would require to know the spin of the annihilating system. Here, the authors do this using a positron-emission tomography scanner, finding no violation with a statistical precision of 10(-4).

引用

页数：9

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