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LHCB_2013_I1243156

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The decays $D^{**} \to D^{*+}\pi^-\to D^0\pi^+\pi^-$ are used to measure the helicity angle, i.e. the angle between the two pions in the rest frame of the $D^*$. The decays of $D_1(2420)^0$, $D^*_2(2460)^0$, $D(2650)^0$, $D(2760)$, $D(2580)$, $D(2740)$, $D(3000)$ were measured,currently the $D(3000)^0$ is not implemented. The data were read from the plots in the papers and therefore for the $D_1(2420)^0$, $D^*_2(2460)^0$ the error bars are the size of the points in the plots.

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