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We study some non leptonic and semileptonic decays of $B_s$ meson into afinal scalar meson $f_0(980)$ in the fourth quark generation model. Since the$f_0(980)$ meson is dominantly composed of ($s \bar s $) pair, the mixinginduced CP asymmetry in the decay mode $B_s \to J/\psi f_0(980)$ would {\it apriori} give $\sin 2 \beta_s$, where $\beta_s$ is the $B_s-\bar B_s$ mixingphase. In the standard model this asymmetry is expected to be vanishinglysmall. We find that in the fourth generation model a large mixing induced CPasymmetry could be possible for this process. Similarly the branching ratios ofthe rare semileptonic decays $B_s \to f_0(980) l^+ l^-$ and $B_s \to f_0(980)\nu \bar \nu$ are found to be enhanced significantly from their correspondingstandard model values.

Study of some B_s to f_0(980) decays in the fourth generation model