A polarization amplitude A$_{{{\mathit D}}}$ is a parameter that depends on the initial polarization of the ${{\mathit D}_{{{3}}}^{*}{(2750)}}$. For ${{\mathit D}_{{{3}}}^{*}{(2750)}}$ decays the helicity angle, ${{\mathit \theta}_{{{H}}}}$, distribution varies like 1 + A$_{{{\mathit D}}}$ cos $({{\mathit \theta}_{{{H}}}})$, where ${{\mathit \theta}_{{{H}}}}$ is the angle in the ${{\mathit D}^{*}}$ rest frame between the two pions emitted by the ${{\mathit D}_{{{3}}}^{*}{(2750)}}$ $\rightarrow$ ${{\mathit D}^{*}}{{\mathit \pi}}$ and ${{\mathit D}^{*}}$ $\rightarrow$ ${{\mathit D}}{{\mathit \pi}}$.

VALUE EVTS DOCUMENT ID TECN  COMMENT • • We do not use the following data for averages, fits, limits, etc. • • $-0.33$ $\pm0.28$ 23.5k 1 DEL-AMO-SANCH.. 2010 P BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit D}^{*+}}{{\mathit \pi}^{-}}{{\mathit X}}$ 1  Systematic uncertainties not estimated. The states observed in the ${{\mathit D}^{*}}{{\mathit \pi}}$ and ${{\mathit D}}{{\mathit \pi}}$ final states are not necessarily the same.

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