Towards Time Reversal Symmetry Test with o-Ps Decays Using the J-PET Detector

Raj, J.; Dilski, Kamil; Czerwiński, E.

doi:10.5506/aphyspolb.51.149

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…A simultaneous search for violation of CP, P and T symmetries in positronium decay can be performed at J-PET with the measurement of the expectation value of the O CP,P,T = i • k j operator. Here the momentum of the i-th annihilation photon k i and the momentum of the scattered photon k i are reconstructed for i determination and the unit vector of the j-th ( j i) annihilation photon k j is also reconstructed [37,40]. The collected statistics of 7 × 10 5 events allows to reach an accuracy of 10 −4 , while the previous test of CP symmetry with o-Ps is at the level of 10 −3 [38].…”

Section: Discrete Symmetriesmentioning

confidence: 99%

Review of physics program at J-PET

Czerwiński

2024

EPJ Web Conf.

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The Jagiellonian - Positron Emission Tomograph (J-PET) is a multi purpose detector for tests of discrete symmetries and quantum entanglement of photons originating from the decay of positronium atoms. The research is per formed by measurement of angular correlations between photons from the an nihilations of the lightest leptonic bound system. The J-PET detector is the only device which enables determination of polarisation of photons from positronium annihilation together with estimation of positronium spin axis on the event-by-event basis. The novelty of the system is based on a usage of plastic scintil-lators as active detection material and trigger-less data acquisition system. The aim of two independent detection setups currently in use together with different annihilation chambers is to improve limits on C, CP and CPT symmetries and to search for the entanglement of photons originating from electron-positron annihilation. Additionally a precise measurement of ortho-positronium life time would allow to test of non-relativistic quantum electrodynamics and search for Mirror Matter.

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Section: Discrete Symmetriesmentioning

confidence: 99%

Review of physics program at J-PET

Czerwiński

2024

EPJ Web Conf.

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“…In J-PET a novel spin-independent operator is constructed for the o − Ps → 3𝛾 annihilations by including the polarization vector of one of the final state photons [4,30]:…”

Section: New Cp and T Operators Using Photon Polarizationmentioning

confidence: 99%

Test of new operators of discrete symmetries with J-PET

Krzemień¹

2022

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

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Search for possible violation of combined charge, parity, and time-reversal symmetries is yet another approach for a test of New Physics. Positronium being a bound state of electron and positron, is the lightest matter-antimatter system and at the same time eingenstate of the C and P operators, which makes it a unique probe in such endeavour. The experimental method consists of the measurement of angular correlations constructed based on the momenta and/or polarization of photons originating from the positronium annihilation, and the positronium spin orientation. The J-PET detector is the only device which enables determination of polarization of photons from positronium annihilation together with estimation of positronium spin axis on the event-by-event basis. This allows exploration of a new class of discrete symmetry-odd operators that has not been investigated before. With first measurements demonstrating such capabilities, we are able to reach the precision of CP and CPT tests at permill level. In this contribution we describe experimental techniques and new results of discrete symmetry tests in the decays of positronium.

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“…In recent years, J-PET has demonstrated its applications in basic science and medical physics [6,7,8,9,10,11,12]. It qualifies as a potential experimental tool for studying the decays of positronium atoms (Ps) [21].…”

Section: Application In Particle and Medical Physicsmentioning

confidence: 99%

“…In recent years, several data collection campaigns have been performed using J-PET as a conventional tomograph [4,5]. In addition, the collaboration is intensively involved in the study of various aspects of positronium atom (Ps) decays in medical [6,7,8] and fundamental research [1,9,10,11,12]. For the fundamental studies, the decays of ortho-positronium atoms (o-Ps), a longer-lived ground state of Ps (mean lifetime is 142 ns in vacuum), are investigated to perform the tests for the discrete symmetries (Charge, Parity and Time reversal) violations.…”

Section: Introductionmentioning

confidence: 99%

Potential of modular J-PET for applications in the field of particle and medical physics

Sharma

Kacprzak

Dulski

et al. 2022

J. Phys.: Conf. Ser.

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Modular J-PET is the new prototype of the Jagiellonian Positron Emission Tomograph. The portability feature due to its modular design makes it a unique tomograph with a larger axial field of view of 50 cm. The complete ring is composed of 24 modules that can be configured as a diagnostic chamber with a diameter of approximately 76 cm or as a detection setup consisting of several modules for experimental studies where multiple photons are generated in a single event. The J-PET collaboration explicitly studies the decays of the positronium atom (Ps), which is a bound state of electron and positron that self-annihilate into multiple photons. The modular J-PET provides a significant phase space covrage for the registration of photons originating from the decays of Ps atoms. In this paper, we discuss the properties of the modular J-PET and its potential applications in medical and particle physics.

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Towards Time Reversal Symmetry Test with o-Ps Decays Using the J-PET Detector

Cited by 5 publications

References 16 publications

Review of physics program at J-PET

Review of physics program at J-PET

Test of new operators of discrete symmetries with J-PET

Potential of modular J-PET for applications in the field of particle and medical physics

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