SEMILEPTONIC DECAYS OF B-MESON INTO CHARMED HIGHER RESONANCES IN THE HEAVY-QUARK EFFECTIVE THEORY

Heavy quark effective theory is applied to semileptonic decays of B mesons into charmed higher resonances D(x), where subscript X denotes various spin-parity states of resonances. We calculate the differential decay rates and branching ratios of the decay B-->D(x)lnu(l). We find that the largest fraction of the semileptonic process B-->D(x)lnu(l) other than D(1869) and D*(2010) is D2*(1P state) whose value is 0.11%. It is also estimated that among the unidentified modes in the semileptonic decays of B meson other than D(1896) and D*(2010) the total contribution of exclusive higher resonance modes to the branching ratios is 0.3%. The results are compared to the recent experimental data and the other theoretical analyses. We discuss also the unidentified modes in the semileptonic decays of B meson which cannot be reduced to the exclusive higher resonance modes.