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

CMS Collaboration; Canelli, M F; Chiochia, V; Kilminster, B; Robmann, P; et al (2014). Search for standard model production of four top quarks in the lepton + jets channel in pp collisions at $\sqrt{s}=8$TeV. Journal of High Energy Physics:154.

## Abstract

A search is presented for standard model (SM) production of four top quarks (tt⎯⎯tt⎯⎯) in pp collisions in the lepton + jets channel. The data correspond to an integrated luminosity of 19.6 fb−1 recorded at a centre-of-mass energy of 8 TeV with the CMS detector at the CERN LHC. The expected cross section for SM tt⎯⎯tt⎯⎯ production is σSMtt⎯tt⎯≈1fb . A combination of kinematic reconstruction and multivariate techniques is used to distinguish between the small signal and large background. The data are consistent with expectations of the SM, and an upper limit of 32 fb is set at a 95% confidence level on the cross section for producing four top quarks in the SM, where a limit of 32 ± 17 fb is expected.

## Abstract

A search is presented for standard model (SM) production of four top quarks (tt⎯⎯tt⎯⎯) in pp collisions in the lepton + jets channel. The data correspond to an integrated luminosity of 19.6 fb−1 recorded at a centre-of-mass energy of 8 TeV with the CMS detector at the CERN LHC. The expected cross section for SM tt⎯⎯tt⎯⎯ production is σSMtt⎯tt⎯≈1fb . A combination of kinematic reconstruction and multivariate techniques is used to distinguish between the small signal and large background. The data are consistent with expectations of the SM, and an upper limit of 32 fb is set at a 95% confidence level on the cross section for producing four top quarks in the SM, where a limit of 32 ± 17 fb is expected.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2014 24 Feb 2015 09:50 14 Feb 2018 23:14 Springer 1029-8479 Gold Publisher DOI. An embargo period may apply. https://doi.org/10.1007/JHEP11(2014)154