The LHC experiments have analyzed the 7 and 8 TeV LHC data in the main Higgs production
and decay modes. Current analyses show a near degeneracy in the relative sign of the Htt ̄and
HWW couplings. In order to remove this degeneracy and strongly constrain these couplings we
have consider single top production in association with a Higgs in the t-channel. This process
can be very sensitive to both the magnitude and the sign of a non-standard top-Higgs coupling.
We show that at 8 TeV center of mass energy and 50 fb−1 integrated luminosity the combination of diphoton and multi-lepton signatures, originating from different combinations of the top and
Higgs decay modes, can be a potential probe to constrain a large portion of the negative top-Higgs
coupling space presently allowed by the ATLAS and CMS global fits.
