B-Meson Production inπ−dInteractions at 7GeVc

We observe substantial $B$-meson production in ${\pi }^{-}d$ interactions at 7 $\frac{\mathrm{GeV}}{c}$. The observed mass and width of the $B$ are 1217 ± 12 MeV and 115 ± 40 MeV, respectively. We find that the $B$ is produced largely in quasi-two-body final states, and, on the basis of the observed ${\Delta }^{0}B$ production cross section, we expect a large $\pi A_{ 2}B$ coupling which should be observable in other reactions.