  Non-perturbative gauge-invariance under the strong and the weak interactions
dictates that the proton contains a non-vanishing valence contribution from the
Higgs particle. By introducing an additional parton distribution function
(PDF), we investigate the experimental consequences of this prediction. The
Herwig 7 event generator and a parametrized CMS detector simulation are used to
obtain predictions for a scenario amounting to the LHC Run II data set. We use
those to assess the impact of the Higgs PDF on the pp->ttbar process in the
single lepton final state. Comparing to nominal simulation we derive expected
limits as a function of the shape of the valence Higgs PDF. We also investigate
the process pp->ttZ at the parton level to add further constraints.
