Search for associated production of a Higgs boson and a single top quark in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search is presented for the production of a Higgs boson in association with a single top quark, based on data collected in 2016 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, which corresponds to an integrated luminosity of 35.9 fb${}^{-1}$. The production cross section for this process is highly sensitive to the absolute values of the top quark Yukawa coupling, $y_t$, the Higgs boson coupling to vector bosons, $g_{\mathrm{HVV}}$, and, uniquely, to their relative sign. Analyses using multilepton signatures, targeting H $\to$ WW, H $\to$ $\tau \tau$, and H $\to$ ZZ decay modes, and signatures with a single lepton and a $\mathrm{b}\overline{\mathrm{b}}$ pair, targeting the H $\to$ $\mathrm{b}\overline{\mathrm{b}}$ decay, are combined with a reinterpretation of a measurement in the H $\to$ $\gamma \gamma$ channel to constrain $y_{\mathrm{t}}$. For a standard model-like value of $g_{\mathrm{HVV}}$, the data favor positive values of $y_{\mathrm{t}}$ and exclude values of $y_{\mathrm{t}}$ below about $-$0.9 $y_{\mathrm{t}}^{\mathrm{SM}}$.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-18-009 (CMS Public Pages)

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