Search for Standard Model Production of Four Top Quarks

A search is presented for standard model (SM) production of four top quarks in pp collisions at the LHC. Using Run-1 data corresponding to an integrated luminosity of 19 fb$^{-1}$, a combination of kinematic reconstruction and multivariate techniques is used to distinguish between the small signal ($\approx 1$ fb) and backgrounds in the lepton + jets channel. The data are consistent with expectations for SM background and signal, and an upper limit of 32 fb is set at a 95$\%$ confidence level on $\sigma^{SM}_{tttt}$, where a limit of 32 fb $\pm$ 17 fb is expected. Further comments on preparation and prospects for Run-2 are also presented.