Speaker
Description
The J-PET [1, 2, 3] is a high-acceptance multi-purpose detector optimized
for the detection of photons from positron-electron annihilation and can be used
in a broad scope of interdisciplinary investigation, e.g. medical imaging, fun-
damental symmetry tests, and quantum entanglement studies, etc. For this
purpose, the Positronium system, which consists of a bound state of an electron
and a positron, is used in experiments where we can test the predictions of quan-
tum electrodynamics (QED). In particular, we look for new physics studying
the Ps triple state, the ortho-positronium (o-Ps), which mainly decays to three
photons.
We look for the so-called Alice or Mirror Matter (MM), a new type of matter
and a suitable candidate for Dark Matter, performing a high-precision measure-
ment of the lifetime of the o-Ps state, to achieve the needed accuracy for testing
the present QED calculations. A discrepancy with the expectation from theory
could indicate the presence of Physics Beyond the SM, i.e. a signal for MM. In
addition, profiting from the triggerless acquisition mode of the J-PET detector,
we are searching for decays of the o-Ps into 4γ and 5γ, the former C-violating
decay and the latter never observed. Present limits in these forbidden and
rare decays can be improved thanks to the large acceptance and high angular
resolution of the J-PET detector.
References
[1] P. Moskal et al. In: Science Advances 7 (2021), eabh4394.
[2] P. Moskal et al. In: Nature Communications 12 (2021), p. 5658.
[3] P. Moskal et al. In: Nature Communications 15 (2024), p. 78.
| session | K. Precision and New Physics |
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