CERN Accelerating science

CMS Note
Report number	CMS-CR-2018-346
Title	Observation of ${\rm t\bar{t}H}$ production at CMS
Author(s)	Diez Pardos, Carmen (DESY)
Collaboration	CMS Collaboration
Publication	SISSA, 2019
Imprint	07 Nov 2018
Number of pages	4
In:	PoS ICHEP2018 (2019) 711
In:	XXXIX International Conference on High Energy Physics, Seoul, Korea, 4 - 11 Jul 2018, pp.611
DOI	10.22323/1.340.0611
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	Recent searches for the production of a Higgs boson (H) in association with a top quark pair (${\rm t\bar{t}H}$) by the CMS Collaboration are presented. They are performed using 36 fb$^{-1}$ of LHC pp collision data at $\sqrt{s}$=13 TeV collected in 2016. The analyses exploit several Higgs boson decay channels, together with different top quark decay modes. The results combined with previous searches yield the first observation of the ${\rm t\bar{t}H}$ production process. An excess of events is observed with a significance of 5.2 standard deviations over the expectation from the background-only hypothesis. The combined best fit signal strength normalized to the standard model prediction is 1.26$^{+0.31}_{-0.26}$.
Copyright/License	publication: © 2019-2025 The Authors (License: CC-BY-NC-ND-4.0)

Corresponding record in: Inspire