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The associated production of Higgs boson and single top quark is ofparticular interest since it is senstive to the relative sign of the Higgsboson coupling to gauge bosons and the Yukawa coupling $y$ to fermions. Thepresented analysis is setting upper production limits on a model with$y_\text{t}=-1$, which has an enhanced cross section compared to the standardmodel expectation. For this it focusses on the Higgs boson decaying to a pairof b quarks and uses the full dataset of $pp$ collisions recorded with the CMSdetector in 2012. It reports an upper limit on 7.57 times the expected crosssection, with an expected sensitivity of 5.14. This translates into theexclusion of associated tHq production with $y_\text{t}=-1$-likecharacteristics with a cross section smaller than 1.77\,pb.

Search for $\text{H}\to \text{b}\bar{\text{b}}$ in association with single top quarks as a test of Higgs couplings