CERN Accelerating science

CMS Note
Report number	CMS-CR-2016-207
Title	ttH results from CMS
Related title	Associated top-quark pair and Higgs boson production at CMS with 13 TeV data
Author(s)	Ntomari, Eleni (DESY)
Publication	2016
Collaboration	CMS Collaboration
Imprint	01 Sep 2016
Number of pages	11
Published in:	PoS LHCP2016 (2016) 083
Presented at	4th Conference on Large Hadron Collider Physics 2016 (LHCP 2016), Lund, Sweden, 13 - 18 Jun 2016, pp.83
DOI	10.22323/1.276.0083
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Keywords	General
Abstract	First results of the search for the associated top-quark pair and Higgs-boson production ($t\bar{t}H$) in proton-proton collisions with center-of-mass energy $\sqrt{s}$ = 13 TeV are presented. The data correspond to an integrated luminosity of 2.3-2.7 fb$^{-1}$ recorded with the CMS experiment in 2015. The $t\bar{t}H$ process allows a direct measurement of the top-Higgs coupling, which is an important test of the Standard Model (SM), and for searching new physics. Three statistically independent analyses are performed and optimized individually according to different Higgs boson decays, and in each of them, the results are obtained for the signal strength cross section ratio of the measurement to the SM prediction, $\hat{\mu}$=$\sigma/\sigma_{SM}$. The decay to bottom quark-antiquark pair $t\bar{t}H(b\bar{b})$ results in $\hat{\mu}_{obs}^{t\bar{t}H(b\bar{b})} = -2.0^{+1.8}_{-1.8}$, the diphoton decay $t\bar{t}H(\gamma\gamma)$ to $\hat{\mu}_{obs}^{t\bar{t}H(\gamma\gamma)} = 3.8^{+4.5}_{-3.6}$, and the decay to multileptons $t\bar{t}H$(multileptons) results in $\hat{\mu}_{obs}^{t\bar{t}H(multilepton)} = 0.6^{+1.4}_{-1.1}$. A combined result of $\hat{\mu}_{obs}^{t\bar{t}H} = 0.15^{+0.95}_{-0.81}$ is obtained, and is compatible with the SM expectation.
Other source	Inspire
Copyright/License	Preprint: (License: CC-BY-4.0)