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A new way of probing new physics in the $B$ meson system is provided. Wedefine double ratios for the observables of $B_{d,s}$-$\Bbar_{d,s}$ mixings and$B_{d,s}\to\mu^+\mu^-$ decays, and find simple relations between theobservables. By using the relations we predict the yet-to-be measured branchingratio of $B_d\to\mu^+\mu^-$ to be $(0.809\sim1.03)\times 10^{-10}$, up to thenew physics models.

New Physics in $B_{d,s}$-$\Bbar_{d,s}$ mixings and $B_{d,s}\to\mu^+\mu^-$ decays