Overview of the Phenomenology of Lorentz and CPT Violation in Atomic Systems

Vargas, Arnaldo J.

doi:10.3390/sym11121433

Cited by 7 publications

(9 citation statements)

References 47 publications

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“…The inherent relation of Lorentz and CPT invariance allows for defining searches of violations of the latter in terms of SME parameters' measurement. A number of possible experiments based on hyperfine spectroscopy of positronium have been postulated using both minimal SME [16] and non-minimal SME scenarios [17].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Discrete Symmetry Tests in the Positronium System with the J-PET Detector

Gajos

2020

Symmetry

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Study of certain angular correlations in the three-photon annihilations of the triplet state of positronium, the electron–positron bound state, may be used as a probe of potential CP and CPT-violating effects in the leptonic sector. We present the perspectives of CP and CPT tests using this process recorded with a novel detection system for photons in the positron annihilation energy range, the Jagiellonian Positron Emission Tomography (J-PET). We demonstrate the capability of this system to register three-photon annihilations with an unprecedented range of kinematical configurations and to measure the CPT-odd correlation between positronium spin and annihilation plane orientation with a precision improved by at least an order of magnitude with respect to present results. We also discuss the means to control and reduce detector asymmetries in order to allow J-PET to set the first measurement of the correlation between positronium spin and momentum of the most energetic annihilation photon which has never been studied to date.

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Section: Introductionmentioning

confidence: 99%

Sensitivity of Discrete Symmetry Tests in the Positronium System with the J-PET Detector

Gajos

2020

Symmetry

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“…The inherent relation of Lorentz and CPT invariance allows for defining searches of violations of the latter in terms of SME paramters' measurement. A number of possible experiments based on hyperfine spectroscopy of positronium have been postulated using both minimal SME [16] and non-minimal SME scenarios [17].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of discrete symmetry tests in the positronium system with the J-PET detector

Gajos¹

2020

Preprint

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Study of certain angular correlations in the three-photon annihilations of the triplet state of positronium, the electron-positron bound state, may be used as a probe of potential CP and CPT-violating effects in the leptonic sector. We present the perspectives of CP and CPT tests using this process recorded with a novel detection system for photons in the positron annihilation energy range, the Jagiellonian PET (J-PET). We demonstrate the capability of this system to register three-photon annihilations with an unprecedented range of kinematical configurations and to measure the CPT-odd correlation between positronium spin and annihilation plane orientation with a precision improved by at least an order of magnitude with respect to present results. We also discuss the the means to control and reduce detector asymmetries in order to allow J-PET to set the first measurement of the correlation between positronium spin and momentum of the most energetic annihilation photon which has never been studied to date.

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“…In fact, as the lightest matter-antimatter bound states, positronium atoms are considered in the context of CPT tests through searches for Lorentz noninvariance. Such tests, based on atomic spectroscopy of positronium have been recently proposed in the theoretical framework of Standard-Model Extension 18,19 .…”

mentioning

confidence: 99%

Testing CPT symmetry in ortho-positronium decays with positronium annihilation tomography

et al. 2021

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Charged lepton system symmetry under combined charge, parity, and time-reversal transformation (CPT) remains scarcely tested. Despite stringent quantum-electrodynamic limits, discrepancies in predictions for the electron–positron bound state (positronium atom) motivate further investigation, including fundamental symmetry tests. While CPT noninvariance effects could be manifested in non-vanishing angular correlations between final-state photons and spin of annihilating positronium, measurements were previously limited by knowledge of the latter. Here, we demonstrate tomographic reconstruction techniques applied to three-photon annihilations of ortho-positronium atoms to estimate their spin polarisation without magnetic field or polarised positronium source. We use a plastic-scintillator-based positron-emission-tomography scanner to record ortho-positronium (o-Ps) annihilations with single-event estimation of o-Ps spin and determine the complete spectrum of an angular correlation operator sensitive to CPT-violating effects. We find no violation at the precision level of 10−4, with an over threefold improvement on the previous measurement.

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Overview of the Phenomenology of Lorentz and CPT Violation in Atomic Systems

Cited by 7 publications

References 47 publications

Sensitivity of Discrete Symmetry Tests in the Positronium System with the J-PET Detector

Sensitivity of Discrete Symmetry Tests in the Positronium System with the J-PET Detector

Sensitivity of discrete symmetry tests in the positronium system with the J-PET detector

Testing CPT symmetry in ortho-positronium decays with positronium annihilation tomography

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