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A large number of top quarks will be produced at the Large Hadron Collider(LHC) for Run II period. This will allow us to measure the rare processes fromthe top sector in great details. We present the study of the top-quark pairproduction in association with a bottom-quark pair (ttbb) from fast simulationsfor the Compact Muon Solenoid (CMS) experiment. The differential distributionsof ttbb are compared with the top-quark pair production with two additionaljets (ttjj) and with the production in association with the Higgs (ttH), wherethe Higgs decays to a bottom-quark pair. The significances of ttbb process inthe dileptonic and semileptonic decay mode are calculated with the datacorresponding to an integrated luminosity of 10 fb-1, which is foreseen to becollected in the early Run II period. This study will be an important input insearching for new physics beyond the standard model as well as in searching forttH process where the Yukawa coupling with the top quark can be directlymeasured.

Study of the Top-quark Pair Production in Association with a Bottom-quark Pair from Fast Simulations at the LHC