Figure 3

Acceptance and efficiency corrected angular distributions of the decay product in the rest frame of the \Dstar meson with respect to the helicity axis. The left panel shows the angular distribution for the charm-enhanced \Dstar sample in pp collisions at $\s=13 \TeV$, selected with the high-multiplicity trigger and the right panel shows the same but for the beauty-enhanced \Dstar sample. The distributions are obtained at midrapidity ($|y|<0.8$) in $5<\pt<7 \GeV/c$ and are fitted with Eq. \ref{eqn1} to extract the \rzz values. Only statistical uncertainties are shown.