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The decay rates for B 0 ->K + π - , B + ->K 0 π + , and the charge-conjugate processes were found to provide information on the weak phase γ=Arg(V ub* ) when the ratio r of weak tree and penguin amplitudes was taken from data on B->ππ or semileptonic B->π decays. We show here that the rates for B s ->K - ...
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