Study of $D^{**}$ production and light hadronic states in the $bar{B}^0 to D^{*+} omega pi^-$ decay

We report on the first observations of $bar{B}^0 to D_1(2430)^0 omega$, $bar{B}^0 to D_1(2420)^0 omega$ and $bar{B}^0 to D^*_2(2460)^0 omega$ decays. The $bar{B}^0 to D^{*+} rho(1450)^-$ decay is also observed. The branching fraction measurements are based on $(771.6 pm 10.6)times 10^6$ $Bbar{B}$ events collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The fractions of longitudinal polarization of the $D^{**}$ states as well as partial wave fractions of the $D_1(2430)^0$ are obtained. We also set a $90%$ confidence level upper limit for the product of branching fractions of $mathcal{B}(bar{B}^0 to D^{*+} b_1(1235)^-) times mathcal{B}(b_1(1235)^- to omega pi^-)$. The measurements show evidence of nontrivial final-state interaction phases for the $rho$-like amplitudes.