Time Reversal Invariance Test at the COSY Ring

Time reversal violation (T –V), like the equivalent violation of the combined symmetries of charge (C) and parity (P) (CP–V), is a necessary ingredient for any theory aiming to address the mystery of the matter–antimatter asymmetry of our Universe - one of the biggest problems in contemporary physics and cosmology. It is widely accepted that a solution of this puzzle will involve new physics Beyond the Standard Model (BSM) of elementary particle physics. At the COoler SYnchroton (COSY) a null test (P–even, T –odd) of time reversal invariance is un- der feasability study as an internal transmission experiment. The parity conserving time–reversal violating observable is the spin correlation parameter AY,XZ in the double–polarized proton–deuteron scattering, which can be accessed by using a polarized proton beam passing through an internal tensor polarized deuterium target.