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We have chosen the $\bar{B}^0 \to D^{*+} \bar{D}^{*0} K^-$ reaction in orderto observe the $I=0, J^P=1^+$ ($R_1$) partner state of the $X_0(2866)$ stemmingfrom the $D^*\bar{K}^*$ molecular picture. The reaction proceeds via externalemission in the most favored Cabibbo decay mode and one observes the $R_1$state as a very strong peak versus the background in the $D^{*+} K^-$ spectrum.The branching ratio for $R_1$ production in this reaction is estimated of theorder of $4\times 10^{-3}$. The method used, applied to the $B^+ \to D^- D^+K^+$ reaction, produces a ratio of signal to background in the $D^- K^+$spectrum in very good agreement with the LHCb experiment that observed the$X_0(2866)$.

The $\bar{B}^0 \to D^{*+} \bar{D}^{*0} K^- $ reaction to detect the $I=0, J^P=1^+$ partner of the $X_0(2866)$

The $\bar{B}^0 \to D^{+} \bar{D}^{0} K^- $ reaction to detect the $I=0, J^P=1^+$ partner of the $X_0(2866)$