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A search is presented for standard model (SM) production of four top quarks($t\bar{t}t\bar{t}$) in pp collisions in the lepton + jets channel. The datacorrespond to an integrated luminosity of 19.6 fb$^{-1}$ recorded at acentre-of-mass energy of 8 TeV with the CMS detector at the CERN LHC. Acombination of kinematic reconstruction and multivariate techniques is used todistinguish between the small signal and large background. The data areconsistent with expectations of the SM, and an upper limit of 32 fb is set at a95\% confidence level on the cross section for producing four top quarks in theSM, where a limit of $32\pm{17}$ fb is expected.

Search for standard model production of four top quarks in the lepton + jets channel in pp collisions at $\sqrt{s} = 8 $ TeV