Tests of discrete symmetries

Sozzi, M.

doi:10.1088/1361-6471/ab4822

Cited by 2 publications

(2 citation statements)

References 200 publications

(226 reference statements)

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“…Any signature of violation of discrete symmetry would come as a non-zero expectation value of such odd operators [19].…”

Section: Cpt Symmetry Test In Positronium Decaysmentioning

confidence: 99%

Improved test of CPT invariance in ortho-positronium decays at J-PET

Chug,

Gajos

2024

Proceedings of 8th Symposium on Prospects in the Physics of Discrete Symmetries — PoS(DISCRETE2022)

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Symmetry violation under the combined transformation of charge (C), parity (P), and time reversal (T) in the charged leptonic sector can be sought through the non-vanishing expectation value of certain angular correlation operators that are odd under the CPT transformation. Here, we discuss the experimental approach for a CPT symmetry test by measuring angular correlations between the spin and momenta of photons originating from ortho-positronium (o-Ps→3𝛾) decays. This experiment is performed with the J-PET detector which measures a broad range of kinematical configurations of ortho-positronium annihilation into three photons and is the first experiment to determine the full range of the CPT-odd angular correlation. A novel technique to estimate the spin of ortho-positronium and momenta of annihilation photons for a single recorded orthopositronium event allowed J-PET to measure the expectation value of CPT symmetry odd angular correlation operator at the precision level of 10 −4 , a factor of three better than the previous best result. There are new measures and perspectives for J-PET in improving the sensitivity to CPT violating effects beyond the level of 10 −4 by increasing the efficiency for detection of photons from ortho-positronium decays by means of using a new modular J-PET detector and spherical annihilation chamber.

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“…Any signature of violation of discrete symmetry would come as a non-zero expectation value of such odd operators [19].…”

Section: Cpt Symmetry Test In Positronium Decaysmentioning

confidence: 99%

Improved test of CPT invariance in ortho-positronium decays at J-PET

Chug,

Gajos

2024

Proceedings of 8th Symposium on Prospects in the Physics of Discrete Symmetries — PoS(DISCRETE2022)

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“…Discrete symmetries violation can be tested by searching for breaking of any of charge conjugation (C), parity (P), time reversal (T) symmetries and their combinations CP and CPT [1,2]. Small violations of all of the above symmetries except for CPT were already observed in certain interactions e.g.…”

Section: Introductionmentioning

confidence: 99%

CPT symmetry test in positronium annihilations with the J-PET detector

Chug¹,

Gajos²

2022

Proceedings of Particles and Nuclei International Conference 2021 — PoS(PANIC2021)

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Discrete symmetry under combined transformation of charge, parity and time reversal (CPT) can be tested in the decays of positronium atom, the lightest bound system built of charged leptons. Jagiellonian Positron Emission Tomograph (J-PET) device constructed from plastic scintillators, detects the photons originating from electron positron annihilation. This feature enables J-PET to study CPT symmetry in the three photon annihilations of the triplet state of positronium. Signs of violation of the CPT symmetry can be sought as a non-vanishing expectation value of an angular correlation operator that is odd under CPT transformation. A technique to estimate the spin of ortho-positronium and momenta of annihilation photons for single recorded ortho-positronium annihilation events allows J-PET to measure the expectation value of a CPT symmetry odd angular correlation operator. J-PET measures a broad range of kinematical configurations of ortho-positronium annihilation to three photons and is the first experiment to determine the full range of the CPT-odd angular correlation.

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Tests of discrete symmetries

Cited by 2 publications

References 200 publications

Improved test of CPT invariance in ortho-positronium decays at J-PET

Improved test of CPT invariance in ortho-positronium decays at J-PET

CPT symmetry test in positronium annihilations with the J-PET detector

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