Study of resonances in exclusive B decays to ¯¯¯D(*)D(*)K

Abstract

We present a study of resonances in exclusive decays of B mesons to ¯¯¯ D ( * ) D ( * ) K . We report the observation of the decays B → ¯¯¯ D ( * ) D + s 1 ( 2536 ) where the D + s 1 ( 2536 ) is reconstructed in the D * 0 K + and D * + K 0 S decay channels. We report also the observation of the decays B → ψ ( 3770 ) K where the ψ ( 3770 ) decays to ¯¯¯ D 0 D 0 and D − D + . In addition, we present the observation of an enhancement for the ¯¯¯ D * 0 D 0 invariant mass in the decays B → ¯¯¯ D * 0 D 0 K , at a mass of ( 3875.1 + 0.7 − 0.5 ± 0.5 ) MeV / c 2 with a width of ( 3.0 + 1.9 − 1.4 ± 0.9 ) MeV (the first errors are statistical and the second are systematic). Branching fractions and spin studies are shown for the three resonances. The results are based on 347 fb − 1 of data collected with the BABAR detector at the PEP-II B factory.