PoS - Proceedings of Science
Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - Higgs and New Physics (Parallel Session). Conveners: Andre David; Marie-Helene Genest; Giuliano Panico. Scientific Secretary: Roberto Rossin.
Latest results on $t\bar{t}H (H → bb)$ production at CMS
D. Salerno*  on behalf of the CMS Collaboration
Full text: pdf
Pre-published on: November 20, 2017
Published on: March 20, 2018
Abstract
Details of the search for the Higgs boson produced in association with top quarks and decaying to bottom quarks at CMS are presented. The data corresponds to the first 12.9 fb$^{-1}$ of 2016 proton-proton collisions at $\sqrt{s}=13$ TeV delivered from the LHC and recorded by the CMS experiment. Candidate events are selected in the lepton+jets and dilepton decay channels of the $\mathrm{t}\bar{\mathrm{t}}$ system. Selected events are categorised into several categories with varying amounts of signal and background. In each category the signal extraction is performed using multivariate techniques combining the matrix element method and boosted decision trees. The results are presented in terms of the signal strength, i.e. the observed $\mathrm{t}\bar{\mathrm{t}}\mathrm{H}$ cross section relative to the standard model prediction, $\mu = \sigma / \sigma_\mathrm{SM}$. A combined fit of the final discriminants across all categories results in an observed (expected) upper limit of $\mu < 1.5 (1.7)$ at the 95% confidence level and a best-fit value of $\mu = -0.19^{+0.45}_{-0.44}(\mathrm{stat.})^{+0.66}_{-0.68}(\mathrm{syst.})$.
DOI: https://doi.org/10.22323/1.314.0335
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