Speaker
Description
Positronium is a Hydrogen-like bound state of an electron and positron, and is an eigenstate of both Charge and Parity transformations. Spin-1 ortho-positronium primarily decays to three photons. Observation of a parity violating angular correlation among the decay products would be a clean indication of combined CP-violation, that cannot be mimicked by final state interactions. We present an overview of searches for symmetry violation in this system and the construction of a new dedicated detector array for an improved search at the Facility for Rare Isotope Beams. This includes development of a positronium source, design and construction of the gamma-detector array, and commissioning the array within a cryogenic superconducting magnet. We will reach a ten-fold improvement in sensitivity over previous searches with a strong control over systematics utilizing time dependence in the magnetic field.
