Parapositronium can decay into three photons

Pokraka, Andrzej; Czarnecki, Andrzej

doi:10.1103/physrevd.96.093002

Cited by 15 publications

(15 citation statements)

References 20 publications

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“…Time reversal symmetry violations have not been observed in purely leptonic systems, so far [2][3][4][5]. The Standard Model predicts photon-photon or weak interaction to both give rise to phenomena mimicking a violation of the symmetry in the order of 10 −9 (photonphoton interaction) and 10 −13 (weak interactions), respectively [3,4,[11][12][13]. There is a difference of about 6 orders of magnitude between the present experimental upper limit and the standard model predictions [5,14,15].…”

Section: Time-reversal Symmetrycontrasting

confidence: 49%

J-PET Monte Carlo Simulations for Time-Reversal Symmetry Test in Ortho-Positronium Decay

2020

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This article reports the development of Monte Carlo simulations of the J-PET detector using the Geant4 toolkit aimed at serving as a foundation for testing the time-reversal symmetry in the decay of ortho-Positronium (o-Ps) atoms. In order to observe asymmetries in time-reversal, it is important to understand the physical properties of the signal candidates (o-Ps → 3γ) recorded by the detector setup. The simulations aim at replicating the experimental procedure of producing meta-stable triplet states of positronium and testing the T-symmetry using symmetry-odd operators with the Jagiellonian-Positron Emission Tomograph (J-PET) detector.

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Section: Time-reversal Symmetrycontrasting

confidence: 49%

J-PET Monte Carlo Simulations for Time-Reversal Symmetry Test in Ortho-Positronium Decay

2020

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“…QED forbidden decays can proceed through weak interactions but with very small branching ratios because of the massive W and Z boson propagators that appear in these reactions. For example, the three photon decay of p-Ps is forbidden in QED but can occur through weak interactions involving a W-boson loop with branching ratio BR(p-Ps → 3γ) = 4.4 × 10 −77 [51]. Tiny branching ratios are found for decays into a photon and two neutrinos [52], less than about 10 −21 for o-Ps and 10 −24 for p-Ps.…”

Section: Qed Tests and α Measurementsmentioning

confidence: 99%

QED and Fundamental Symmetries in Positronium Decays

Bass¹

2019

Acta Phys. Pol. B

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“…In principle weak interactions apply, but at a level that is very far away from any experiment currently conceivable [142,143]. Therefore Ps is extremely well described by (boundstate) quantum electrodynamics (QED) [144,145], and hence can be used to test the theory.…”

Section: Intrinsic Properties Of Positroniummentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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Parapositronium can decay into three photons

Cited by 15 publications

References 20 publications

J-PET Monte Carlo Simulations for Time-Reversal Symmetry Test in Ortho-Positronium Decay

J-PET Monte Carlo Simulations for Time-Reversal Symmetry Test in Ortho-Positronium Decay

QED and Fundamental Symmetries in Positronium Decays

Experimental progress in positronium laser physics

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