Speaker
Description
A simultaneous measurement of twenty-five jet substructure observables is presented using large-radius jets with high transverse momentum from proton-proton collisions at $\sqrt{s}=13$ TeV. The measurement is carried out on QCD dijet events and $t\overline{t}$ events enriched in boosted, hadronic decays of W bosons and top quarks. The three data samples consist of jets with one, two, and three prongs from the showering and hadronisation of a light quark or gluon, two quarks and three quarks, respectively. The data correspond to an integrated luminosity of 138 $\mathrm{fb}^{-1}$, recorded by the CMS experiment between 2016--2018. A detailed characterisation of the jet substructure is provided using a 6-body basis of $N$-subjettiness observables that over-constrains the phase space of the resolved emissions in the jet. The measurements are unfolded to the level of stable particles, and an estimate of the particle-level correlations between observables is provided, ensuring that the results can be used to systematically assess and refine the modelling of radiation in jets.