37  0  0.05  0.1  0.15  0.2  0  0.002  0.004  0.006  0.008  0.01  0.012  0.014 A CP t’ FIG. 11: The allowed range of the CP asymmetry difference (Δ A$_{CP}$ ) in the (Δ A$_{CP}$ − λ ′$_{t}$ ) plane, where the red and blue regions correspond to m$_{t}$ ′ = 400 and 600 GeV; grey shaded regions corre- spond to the uncertainties due to hadronic parameters. FIG. 12: Correlation plots between the mixing induced CP asymmetry S$_{π}$ $^{0}$K$_{s}$ and the direct CP asymmetry A$_{π}$ $^{0}$K$_{s}$ in the SM (left panel) and in the fourth generation model (right panel) where the red and blue regions correspond to m$_{t}$ ′ =400 and 600 GeV . The horizontal and vertical lines represent 1 σ experimental allowed ranges.  0.4  0.5  0.6  0.7  0.8  0.9  1 -0.1 -0.05  0  0.05  0.1 S$^{π}$ 0  K s A $^{0}$ K$_{s}$  0.4  0.5  0.6  0.7  0.8  0.9  1 -0.1 -0.05  0  0.05  0.1 S$^{π}$ 0  K s A $^{0}$ K$_{s}$ imposing the constraint that the corresponding branching ratios should be within the three sigma experimental range. Also we have included 20% uncertainty in Λ$_{QCD}$ i.e we varied Λ$_{QCD}$ = 225 MeV from its nominal value in SM3 [38] by ± 45 MeV, which enters in the