Speaker
Description
The Jagiellonian Positron Emission Tomograph (J-PET) was constructed as the first PET scanner using plastic scintillators. However, it also constitutes a robust photon detector useful for a broad range of experiments involving orto-positronium (o-Ps) decays into three photons.
We will present an overview of studies performed with o-Ps→3γ decays in J-PET with a view to searching for signals of discrete symmetries violation. The discussed studies will comprise measurements of angular correlations between the photons’ momenta and positronium spin direction as well as a new class of operators sensitive to discrete symmetries violation involving photon polarization.
To date, the most precise tests of the CP and CPT symmetries using ortho-positronium decays reached the precision of 3$\times 10^{-3}$ whereas effects limiting the sensitivity are only expected at the level of $10^{-9}$. With an angular resolution and o-Ps polarization control improved with respect to previous measurements, J-PET aims at achieving the sensitivity to CP and CPT violation signals at a precision level of at least $10^{-4}$.
