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We present two analyses dedicated to measure the ratio of branching ratios ofthe top quark, R=B(t->Wb)/(t->Wq) (where q=d,s,b), using ttbar events witheither one or two prompt isolated leptons (e or mu) in the final state.Furthermore the framework of the dileptonic analysis was used also for afeasibility study of the measurement of b-tagging efficiency, by assuming the Rvalue to be the Standard Model one. Data-driven techniques to control thebackground in the selected events are discussed and the expected simulationresults are presented.

Probing the Heavy Flavor Content in t tbar Events and Using t tbar Events as a Calibration Tool at CMS