Fig. 2: Ratios of splitting angle probability distributions.
From: Direct observation of the dead-cone effect in quantum chromodynamics
The ratios of the splitting-angle probability distributions for D0-meson tagged jets to inclusive jets, R(θ), measured in proton–proton collisions at \(\sqrt{s}=13\) TeV, are shown for 5 < ERadiator < 10 GeV (left panel), 10 < ERadiator < 20 GeV (middle panel) and 20 < ERadiator < 35 GeV (right panel). The data are compared with PYTHIA v.8 and SHERPA simulations, including the no dead-cone limit given by the ratio of the angular distributions for light-quark jets (LQ) to inclusive jets. The pink shaded areas correspond to the angles within which emissions are suppressed by the dead-cone effect, assuming a charm-quark mass of 1.275 GeV/c2.
