Measurement of jet substructure observables in tt¯ events from proton-proton collisions at s=13 TeV
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Abstract
A measurement of jet substructure observables is presented using t t events in the lepton jets channel from proton-proton collisions at ffiffi ffi s p 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, S m Z 0.115 0.015 -0.013 , is extracted from the substructure data at leading-order plus leading-log accuracy.
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