Abstract
As a relatively simple and purely leptonic state positronium constitutes a unique system to study discrete symmetries with precision limited only by the effects due to the weak interaction and photon-photon scattering. The experimental tests in the positronium decays were performed only on theC, CPandCPTsymmetries with sensitivity much smaller than the predictions which opens a large window to search for phenomena beyond the Standard Model. In this article we present capability of the J-PET detector to improve the current precision of discrete symmetries tests in the decays of positronium atoms.
Highlights
Discrete symmetries of Parity P, Charge Conjugation C and Time Reversal T and their combinations, CP and CPT play an essential role in the modern particle physics
They prove to be very useful in the formulation of the Standard Model and calculation of many quantities, e.g. cross sections or decay rates, especially for the processes governed by the strong interaction
The CPT invariance is of a great importance since its violation would be an unambiguous sign of phenomena beyond the Standard Model
Summary
Discrete symmetries of Parity P, Charge Conjugation C and Time Reversal T and their combinations, CP and CPT play an essential role in the modern particle physics. They prove to be very useful in the formulation of the Standard Model and calculation of many quantities, e.g. cross sections or decay rates, especially for the processes governed by the strong interaction. A lot of effort was made to precisely measure the degree of CP violation in the neutral kaons [5,6,7] and B mesons system [8], but there are still several open issues under investigation. There have been performed many tests, including neutral kaons [10, 17,18,19], B mesons [20] and positronium decays [21], and so far this symmetry seems to be exact for all the known interactions
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