Measurement of jet substructure observables in $\mathrm{t\overline{t}}$ events from proton-proton collisions at $\sqrt{s} =$ 13TeV

TL;DR

This paper measures jet substructure observables in top-antitop events at 13 TeV, comparing results to theoretical predictions and extracting the strong coupling constant at the Z boson mass.

Contribution

It provides detailed measurements of jet substructure in top-antitop events and compares them to multiple theoretical models, extracting a value for the strong coupling constant.

Findings

Jet substructure observables are measured for different jet flavors.

Results are unfolded to particle level and compared to NLO predictions.

A value of ppa_S(m_Z) = 0.115 is extracted from the data.

Abstract

A measurement of jet substructure observables is presented using $\mathrm{t\overline{t}}$ events in the lepton+jets channel from proton-proton collisions at $\sqrt{s} =$ 13 TeV recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 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 Z boson mass, $\alpha_S(m_\mathrm{Z}) = $ 0.115 $^{+0.015}_{-0.013}$, is extracted from the substructure data at leading-order plus leading-log accuracy.