A search is presented for the standard model Higgs boson produced in association with top quarks using the full Run II proton-antiproton collision data set, corresponding to $9.45{\mathrm{fb}}^{-1}$, collected by the Collider Detector at Fermilab. No significant excess over the expected background is observed, and $95\%$ credibility-level upper bounds are placed on the cross section $\sigma (t\overline{t}H\to \mathrm{\text{lepton}}+\mathrm{\text{missing transverse energy}}+\mathrm{\text{jets}})$. For a Higgs boson mass of $125\mathrm{GeV}/c^2$, we expect to set a limit of 12.6 and observe a limit of 20.5 times the standard model rate. This represents the most sensitive search for a standard model Higgs boson in this channel to date.

• Received 14 August 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.181802