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The recent observation of the mass difference in $B_s$ system seems to be notin complete agreement with the corresponding standard model value. We considerthe model with an extra vector like down quark to explain this discrepancy andobtain the constraints on the new physics parameters. Thereafter, we show thatwith these new constraints this model can successfully explain other observeddeviations associated with $b \to s$ transitions, namely, $B_s \to \psi \phi$,$B\to K \pi$ and $B\to \phi K_s$.

$B_s^0 - \bar B_s^0$ mixing and $b \to s $ transitions in isosinglet down quark model