Abstract
Semileptonic B decays into excited charmed mesons D′0 and D′1 are studied in the framework of heavy quark effective field theory (HQEFT) up to the order 1/mQ. They are characterized by a single leading Isgur–Wise function τ and several wavefunctions arising at 1/mQ order. τ and the 1/mQ order functions χb0, χc0 related to the kinetic energy operators are evaluated through the QCD sum rule approach; zero recoil values of the 1/mQ order functions κ1, κ2, κ′1 and κ′2 are extracted from the meson masses, and the branching ratios are found to be suppressed by the 1/mQ corrections. It is concluded that the next leading order wavefunctions can be significant. However, it does not change the previous prediction that the production rate of charmed mesons dominates over that of doublets.
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