21 -0.002  0  0.002  0.004  0.006  0.008  0.01 -1 -0.8 -0.6 -0.4 -0.2  0 A CP ( B -> X s  l +  l -  ) S FIG. 4: Correlation between CP asymmetry in B → X$_{s}$ℓ $^{+}$ℓ − (high- q 2 region) and S$_{ψφ}$ . In the SM both the values are very small and in the plot they correspond to the point [ − 0 . 04 , 0 . 0] . The red and blue regions correspond to m$_{t}$ ′ = 400 and 600 GeV whereas the vertical lines represent 2 σ experimental range for S$_{ψφ}$ . where From the expression for g ( ˆ m, z ) it is clear that the strong phase in g ( ˆ m$_{u/d}$, z ) and g ( ˆ m$_{c}$, z ) is responsible for CP asymmetry in B → X$_{s}$ℓ $^{+}$ℓ − within the SM. g ( ˆ m$_{u/d}$, z ) is complex in both high and low- q 2 region whereas g ( ˆ m$_{c}$, z ) is complex only in the high- q 2 region. On the other hand g ( ˆ m$_{b}$, z ) is always real. The SM CP asymmetry in high- q 2 region is almost zero since Im( ξ$_{2}$ ) is very small, almost one order in magnitude relative to its value in low- q 2 region, due to the relative cancellations of strong phases in ξ$_{2}$ . In the presence of new physics ξ$_{2}$ is unaffected but ξ$_{1}$ increases with the new physics coupling . On the other hand we have contribution from the second term of eq. (69) as a whole the CP asymmetry will increase X$_{re}$ = 2 { Re ( λ s tt ′ ) Re ( ξ$_{1}$ ) + Re ( λ s tt ′ λ s $_{tu}$∗ ) Re ( ξ$_{2}$ ) } , (70) X$_{im}$ = 2 { Im ( λ s tt ′ ) Im ( ξ$_{1}$ ) + Im ( λ s tt ′ λ s $_{tu}$∗ ) Im ( ξ$_{2}$ ) } , (71) B$_{1}$ = 2 { | ξ$_{1}$ | 2 + | λ s $_{tu}$ξ$_{2}$ | 2 + 2Re ( λ s $_{tu}$) Re ( ξ$_{1}$ξ ∗ $_{2}$) } , (72) s B$_{2}$ = 2 C$_{7}$ { Re( ξ$_{1}$ ) + Re( λ $_{tu}$)Re( ξ$_{2}$ ) } , (73) | C tot 10 | 2 = ( C$_{10}$ ) 2 + | λ s tt ′ | 2 ( C t ′ 10 ) 2 + 2 C$_{10}$C t ′ $_{10}$Re ( λ s tt ′ ) , (74) ′ 2 ′ | C tot 7 | 2 = ( C$_{7}$ ) 2 + | λ s tt ′ | 2 C t ′ 7 + 2 C$_{7}$C t ′ 7 Re ( λ s tt ′ ) . (75)