Semileptonic decays ofB mesons into excited charm mesons: Leading order and 1/m c contributions

We use the heavy quark effective theory to investigate the form factors that describe the semileptonic decays of aB meson into excited daughter mesons. For an excited daughter meson with charm, a single form factor is needed at leading order, while five form factors and two dimensionful constants are needed to order 1/m _c in the heavy quark expansion. For non-charmed final states, a total of four form factors are needed at leading order. For the processBD ^* X, four form factors are also needed at leading order.