Search for ttH(bb) events at 13 TeV in the fully hadronic final state targeting large-radius jets and a resolved decay of the Higgs boson with the CMS experiment

A search for ttH(bb) events in the fully hadronic final state is performed using data collected by the CMS experiment in proton-proton collisions at the center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 inverse femtobarns. The analysis is based on the study of events in the boosted topology, i.e., events in which the decay products of at least one particle have a high Lorentz boost and are thus reconstructed in the detector as a single, large-radius jet. In this search, the Higgs boson is required to decay to a pair of well-separated jets. The observed (expected) upper limit at 95% confidence level on the signal strength parameter, defined as the ratio of the measured ttH production cross section to the one expected from a standard model Higgs boson, is found to be 11.5 (15.8) times the expectation from the standard model. By performing a combination with a complementary search targeting decays of the Higgs boson to a large-radius jet, the observed (expected) upper limit at 95% confidence level on the signal strength parameter is found to be 7.1 (9.0) times the expectation from the standard model.