Measurement of the differential $\mathrm{t\bar{t}}$ cross section with high-$p_\mathrm{T}$ top-quark jets in the all-hadronic channel at $\sqrt{s}=8~\mathrm{TeV}$

A measurement of the differential $\mathrm{t\bar{t}}$ production cross section using $19.7~\mathrm{fb}^{-1}$ of all-jet events with high-$p_\mathrm{T}$ top-quark jets collected by the CMS detector at $\sqrt{s} = 8~\mathrm{TeV}$ is presented. This measurement focuses on events where both top quarks decay hadronically, giving rise to a dijet topology. Techniques based on jet substructure are used to suppress standard model backgrounds dominated by QCD multijet production. The remaining background is estimated from data. The $\mathrm{t\bar{t}}$ event yield is extracted in bins of the measured leading top-quark $p_\mathrm{T}$ using a likelihood fit of the invariant mass distribution of top-quark jet candidates. After correcting to parton level, the measured cross section as a function of the leading top-quark $p_\mathrm{T}$ is found to be in agreement with the NLO calculations. $$\textit{This document has been revised with respect to the version dated September 14, 2017.}$$