Results of a study of the substructure of the highest transverse momentum ($p_T$) jets observed by the CDF Collaboration are presented. Events containing at least one jet with $p_T>400\mathrm{GeV}/c$ in a sample corresponding to an integrated luminosity of $5.95{\mathrm{fb}}^{-1}$, collected in 1.96 TeV proton-antiproton collisions at the Fermilab Tevatron collider, are selected. A study of the jet mass, angularity, and planar-flow distributions is presented, and the measurements are compared with predictions of perturbative quantum chromodynamics. A search for boosted top-quark production is also described, leading to a 95% confidence level upper limit of 38 fb on the production cross section of top quarks with $p_T>400\mathrm{GeV}/c$.

• Received 15 July 2014

DOI:https://doi.org/10.1103/PhysRevD.91.032006