A measurement of jet substructure observables is presented using $t\overline{t}$ events in the $\mathrm{lepton}+\text{jets}$ channel from proton-proton collisions at $\sqrt{s}=13\mathrm{TeV}$ recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of $35.9{\mathrm{fb}}^{-1}$. Multiple jet substructure observables are measured for jets identified as bottom, light-quark, and gluon jets, as well as for inclusive jets (no flavor information). The results are unfolded to the particle level and compared to next-to-leading-order predictions from powheg interfaced with the parton shower generators pythia 8 and herwig 7, as well as from sherpa 2 and Dire 2. A value of the strong coupling at the $\mathrm{Z}$ boson mass, ${\alpha }_S(m_{\mathrm{Z}})=0.115_{-0.013}^{+0.015}$, is extracted from the substructure data at leading-order plus leading-log accuracy.

• Received 22 August 2018

DOI:https://doi.org/10.1103/PhysRevD.98.092014

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© 2018 CERN, for the CMS Collaboration