a problem. In Fig. \[bm\_4pi\_all\_4\] we show the $B$ candidate mass distribution for the $D^{*+}\omega\pi^-$ final state summing over all three $D^o$ decay modes. (The signal is fit with the same prescription as before.) There are 136$\pm$15 events in the peak.

In Fig. \[m4pi\_c4\_all\] we show the $\omega\pi^-$ mass spectrum in the left-side plot. The solid histogram shows events from the lower $M_B$ sideband region suitably normalized. The dotted histogram shows the background estimate from the $\Delta E$ sidebands, again normalized. In the signal distribution there is a wide structure around 1.4 GeV, that is inconsistent with background. We re-determine the $\omega\pi^-$ mass distribution by fitting the $M_B$ distribution in bins of $\omega\pi^-$ mass, and this is shown on the right-side. Fitting to a Breit-Wigner function, we find a peak value of 1416$\pm$37 MeV and a width of 402$\pm$47 MeV. These numbers change to 1432$\pm$37 MeV and 376$\pm$47 MeV, respectively, after applying a correction for the variation of efficiency with mass.

Knowing the $\omega\pi^-$ mass dependence of the efficiency we evaluate the branching fraction: $${\cal B}(\overline{B}^o\to D^{*+}\omega\pi^-)=(0.29 \pm 0.03 \pm 
0.04)\%~~~.$$

We tentatively label the state at 1432 MeV the $A^-$ and investigate its properties later. The $\omega\pi^-$ comprises about 