Speaker
Description
The study of jet substructure provides tests of Quantum Chromodynamics (QCD) and offers differential ways to study hadronization mechanisms. QCD predicts that jet radiation patterns depend on the mass and color charge of the initiating parton. Parton showers are sensitive to the different Casimir factors of quarks and gluons, and to the parton mass through the dead-cone effect.
In this talk, we present three sets of charm-tagged jet measurements, using $\mathrm D^{0}$-meson-tagged jets. The first consists of measurements of the angular differences between three different axis definitions inside the jets. The three definitions offer different sensitivity to wide-angle soft radiation and systematically probe the radiation pattern from charm quarks. The second regards jet angularities, which characterise the weighted angular distribution of the jet constituents. These powerful observables probe the parton shower, with sensitivity to parton-mass and Casimir-factor related effects that can be tuned by adjusting the importance of wide-angle radiation. Finally, we present the first measurement of the energy-energy correlator for $\mathrm D^{0}$-meson-tagged jets. This observable reveals the detailed structure of QCD radiation from heavy quarks, allowing for a distinction between perturbative and non-perturbative effects in charm-quark showers.
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