Search for single top + Higgs production with CMS

We present a search 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 $35.9\ \mathrm{fb}^{−1}$. The production cross section for this process is highly sensitive to the absolute values of the top quark Yukawa coupling, $\mathrm{y_t}$, the Higgs boson coupling to vector bosons, $g_{\mathrm{HVV}}$, and, uniquely, to their relative sign. Analyses using multilepton signatures, targeting $\mathrm{H} \rightarrow \mathrm{WW}, \mathrm{H} \rightarrow \tau \tau$, and $\mathrm{H} \rightarrow \mathrm{ZZ}$ decay modes, and signatures with a single lepton and a $\mathrm{b\bar{b}}$ pair, targeting the $\mathrm{H} \rightarrow \mathrm{b\bar{b}}$ decay, are combined with a reinterpretation of a measurement in the $\mathrm{H} \rightarrow \gamma \gamma$ channel to constrain $\mathrm{y_t}$ . For a standard model-like value of $g_\mathrm{{HVV}}$, the data favor positive values of $\mathrm{y_t}$ and exclude values of $\mathrm{y_t}$ below about $−0.9 \mathrm{y^{SM}_t}$.