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When a neutral meson $(P^0 \text{ or } \bar P^0)$ decays to two vectorparticles, a large number of observables can be constructed from differentialdecay rate based on the polarization of final state. But, theoretically, all ofthem are not independent to each other and hence, some relations amongobservables emerge. These relations have been well studied in the scenario withno $T$ and $CPT$ violation in neutral meson mixing and no direct $CP$ violationas well. In this paper, we have studied the relations among observables in thepresence of $T$, $CP$ and $CPT$ violating effects in mixing only. We find thatexcept four of them, all the other old relations get violated and new relationsappear if $T$ and $CPT$ violations in mixing are present. Invalidity of theserelation will signify the presence of direct violation of $T$, $CP$ and $CPT$(i.e. violation in the decay itself).

Behaviour of observables for neutral meson decaying to two vectors in the presence of $T$, $CP$ and $CPT$ violation in mixing only