2 ) = 5746.9 ± 2.4 (stat.) ± 1.0 (syst.) ± 0.5 (PDG) MeV/c 2 .The production rate of narrow B * * d → Bπ resonances relative to the B + meson is determined to be [13.9 ± 1.9 (stat.) ± 3.2 (syst.)] %.The same B + sample is also used to reconstruct the analogous states in the B