Searches for discrete symmetries violation in <i>ortho</i>-positronium decay using the J-PET detector

Kamińska, D.; Gajos, A.; Czerwiński, E.; Bednarski, T.; Białas, P.; Gorgol, M.; Jasińska, B.; Kapłon, Ł.; Korcyl, G.; Kozik, T.; Krzemień, W.; Kubicz, E.; Niedźwiecki, Szymon; Pałka, M.; Raczyński, L.; Rudy, Z.; Rundel, O.; Sharma, N.G.; Silarski, M.; Słomski, Adam; Strzelecki, Adam; Wieczorek, A.; Wiślicki, W.; Zieliński, Marcin; Zgardzińska, B.; Moskal, P.

doi:10.1515/nuka-2015-0131

Cited by 9 publications

(10 citation statements)

References 37 publications

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“…J-PET being a novel solution in the Positron Emmision Tomography provides also new opportunities to study fundamental physics in the leptonic sector [1,2,11,12] as well as in the life-and materialsciences [5,[13][14][15]. In particular it has a potential for improvement of present limits [16,17] of the decays of positronium [1].…”

Section: Discussionmentioning

confidence: 99%

J-PET detector system for studies of the electron-positron annihilations

et al. 2016

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Abstract. Jagiellonian Positron Emission Tomograph (J-PET) has been recently constructed at the Jagiellonian University as a prototype of a cost-effective scanner for the metabolic imaging of the whole human body. J-PET detector is optimized for the measurement of momentum and polarization of photons from the electron-positron annihilations. It is built out of strips of plastic scintillators, forming three cylindrical layers. As detector of gamma quanta it will be used for studies of discrete symmetries and multiparticle entanglement of photons originating from the decays of ortho-positronium atoms.

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Section: Discussionmentioning

confidence: 99%

J-PET detector system for studies of the electron-positron annihilations

et al. 2016

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“…Typical topology of o − P s → 3γ and two kinds of background events are indicated. The figures are adapted from [76,94] 4.9. Physical background due to the positronium production method Due to the short life-time of p-Ps ( 0.125 ns) and short average time of direct annihilations (about 0.5 ns) their misidentification as o − P s → 3γ events can be reduced to a negligible level by the requirement that the time difference between the deexcitation and annihilation photons is larger than e.g.…”

Section: Reduction Of the Instrumental Backgroundmentioning

confidence: 99%

Potential of the J-PET Detector for Studies of Discrete Symmetries in Decays of Positronium Atom --- A Purely Leptonic System

Moskal¹,

Alfs²,

Bednarski³

et al. 2016

Acta Phys. Pol. B

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The Jagiellonian Positron Emission Tomograph (J-PET) was constructed as a prototype of the cost-effective scanner for the simultaneous metabolic imaging of the whole human body. Being optimized for the detection of photons from the electron-positron annihilation with high time-and high angular-resolution, it constitutes a multi-purpose detector providing new opportunities for studying the decays of positronium atoms.Positronium is the lightest purely leptonic object decaying into photons. As an atom bound by a central potential it is a parity eigenstate, and as an atom built out of an electron and an anti-electron it is an eigenstate of the charge conjugation operator. Therefore, the positronium is a unique laboratory to study discrete symmetries whose precision is limited in prin-(1) arXiv:1602.05226v1 [nucl-ex] 16 Feb 2016 2 ciple by the effects due to the weak interactions expected at the level of (∼ 10 −14 ) and photon-photon interactions expected at the level of (∼ 10 −9 ).The J-PET detector enables to perform tests of discrete symmetries in the leptonic sector via the determination of the expectation values of the discrete-symmetries-odd operators, which may be constructed from the spin of ortho-positronium atom and the momenta and polarization vectors of photons originating from its annihilation. In this article we present the potential of the J-PET detector to test the C, CP, T and CPT symmetries in the decays of positronium atoms.

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“…This results in 384 analog channels that have to be processed by the Data Acquisition System (DAQ). The J-PET prototype will be used for investigations in the field of medical imaging [5,11], nanobiology [12], material science [13,14] and for testing of fundamental symmetries in physics [15,16]. In this paper, we present a complete solution for the DAQ system together with the readout mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Sampling FEE and Trigger-less DAQ for the J-PET Scanner

Korcyl¹,

Alfs²,

Bednarski³

et al. 2016

Acta Phys. Pol. B

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In this paper, we present a complete Data Acquisition System (DAQ) together with the readout mechanisms for the J-PET tomography scanner. In general detector readout chain is constructed out of Front-End Electronics (FEE), measurement devices like Time-to-Digital or Analogto-Digital Converters (TDCs or ADCs), data collectors and storage. We have developed a system capable for maintaining continuous readout of digitized data without preliminary selection. Such operation mode results in up to 8 Gbps data stream, therefore it is required to introduce a dedicated module for online event building and feature extraction. The Central Controller Module, equipped with Xilinx Zynq SoC and 16 optical transceivers serves as such true real time computing facility. Our solution * Presented at Jagiellonian Symposium on Fundamental and Applied Subatomic Physics arXiv:1602.05251v1 [physics.ins-det] 17 Feb 2016 for the continuous data recording (trigger-less) is a novel approach in such detector systems and assures that most of the information is preserved on the storage for further, high-level processing. Signal discrimination applies an unique method of using LVDS buffers located in the FPGA fabric.

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Searches for discrete symmetries violation in ortho-positronium decay using the J-PET detector

Cited by 9 publications

References 37 publications

J-PET detector system for studies of the electron-positron annihilations

J-PET detector system for studies of the electron-positron annihilations

Potential of the J-PET Detector for Studies of Discrete Symmetries in Decays of Positronium Atom --- A Purely Leptonic System

Sampling FEE and Trigger-less DAQ for the J-PET Scanner

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