Angular-correlation test of<i>CPT</i>in polarized positronium

Arbic, Brian K.; Hatamian, S.; Skalsey, M.; House, J. Van; Zheng, W.

doi:10.1103/physreva.37.3189

Cited by 57 publications

(77 citation statements)

References 24 publications

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“…An ideal object for this kind of studies is the positronium atom: a system of lepton and antilepton bound via electromagnetic interaction. A test of the discrete symmetries in the decays of positronium into photons is limited by the photon-photon interaction which is expected to mimic the symmetry violation at the level of about 10 −9 only [10,11]. This is still about six orders of magnitude smaller than the present experimental limits equal to about 3×10 −3 [12,13].…”

Section: Introductionmentioning

confidence: 62%

Studies of discrete symmetries in a purely leptonic system using the Jagiellonian Positron Emission Tomograph

et al. 2016

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Abstract. Discrete symmetries such as parity (P), charge-conjugation (C) and time reversal (T) are of fundamental importance in physics and cosmology. Breaking of charge conjugation symmetry (C) and its combination with parity (CP) constitute necessary conditions for the existence of the asymmetry between matter and antimatter in the observed Universe. The presently known sources of discrete symmetries violations can account for only a tiny fraction of the excess of matter over antimatter. So far CP and T symmetries violations were observed only for systems involving quarks and they were never reported for the purely leptonic objects. In this article we describe briefly an experimental proposal for the test of discrete symmetries in the decays of positronium atom which is made exclusively of leptons. The experiments are conducted by means of the Jagiellonian Positron Emission Tomograph (J-PET) which is constructed from strips of plastic scintillators enabling registration of photons from the positronium annihilation. J-PET tomograph together with the positronium target system enable to measure expectation values for the discrete symmetries odd operators constructed from (i) spin vector of the ortho-positronium atom, (ii) momentum vectors of photons originating from the decay of positronium, and (iii) linear polarization direction of annihilation photons. Linearly polarized positronium will be produced in the highly porous aerogel or polymer targets, exploiting longitudinally polarized positrons emitted by the sodium 22 Na isotope. Information about the polarization vector of orthopositronium will be available on the event by event basis and will be reconstructed from the known position of the positron source and the reconstructed position of the orthopositronium annihilation. In 2016 the first tests and calibration runs are planned, and the data collection with high statistics will commence in the year 2017.

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Section: Introductionmentioning

confidence: 62%

Studies of discrete symmetries in a purely leptonic system using the Jagiellonian Positron Emission Tomograph

et al. 2016

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“…[7]. The fulfillment of the C-, P-, CP-, CPT-invariance has been verified in experiments [8][9][10]. The P-(particularly T-) violation in positronium calculated on the basis of the Weinberg-Salam model [7] is much smaller than the modern experimental accuracy.…”

Section: Theoretical Backgroundmentioning

confidence: 94%

To the Possibility of Measurements of Orthopositronium Annihilation Amplitudes for QED Testing

Baryshevsky

Metelitsa

1995

Acta Phys. Pol. A

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In connection with previously revealed disagreement of theoretically calculated and measured orthopositronium decay rate in vacuum we suggest the experiment to clarify which of the positronium annihilation amplitudes R"" m = 0, ±1 causes this disagreement. The developed for this purpose experimental procedure can also be used as the basis for the new area of positron spectroscopy, connected with the investigation of the anisotropic (spin dependent) interaction of positronium in the media.

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“…[3]), there have been only a few experiments investigating their conservation in the leptonic sector [4][5][6][7][8]. Orthopositronium (o-Ps), the triplet bound state of electron and positron, was pointed out as a purely leptonic system sensitive to symmetry violation effects [9] and several angular correlations observable in the ortho-positronium decays into three photons have been defined [10].…”

Section: Prospects Of Discrete Symmetry Studies With the J-pet Detectormentioning

confidence: 99%

Trilateration-based reconstruction of ortho -positronium decays into three photons with the J-PET detector

Gajos

Kamińska

Czerwiński

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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This work reports on a new reconstruction algorithm allowing to reconstruct the decays of ortho-positronium atoms into three photons using the places and times of photons recorded in the detector. The method is based on trilateration and allows for a simultaneous reconstruction of both location and time of the decay. allows for discrimination of background from random three-photon coincidences as well as for application of a novel method for determination of the linear polarization of ortho-positronium atoms, which is also introduced in this work.

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Angular-correlation test ofCPTin polarized positronium

Cited by 57 publications

References 24 publications

Studies of discrete symmetries in a purely leptonic system using the Jagiellonian Positron Emission Tomograph

Studies of discrete symmetries in a purely leptonic system using the Jagiellonian Positron Emission Tomograph

To the Possibility of Measurements of Orthopositronium Annihilation Amplitudes for QED Testing

Trilateration-based reconstruction of ortho -positronium decays into three photons with the J-PET detector

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