SEMILEPTONIC B DECAYS INTO EXCITED CHARMED MESONS $(D_1,D^*_2)$ IN HQEFT

Abstract

Exclusive semileptonic B decays into excited charmed mesons [Formula: see text] are studied up to the order of 1/mQin the framework of the heavy quark effective field theory (HQEFT), which contains the contributions of both particles and antiparticles. Two wave functions [Formula: see text] and [Formula: see text], which characterize the contributions from the kinematic operator at the order of 1/mQ, are calculated by using QCD sum rule approach in HQEFT. Zero recoil values of other two wave functions [Formula: see text] and [Formula: see text] are extracted from the excited charmed-meson masses. Possible effects from the transition wave functions arising from the chromomagnetic operators at the order of 1/mQare analyzed. It is shown that the experimental measurements for the branching ratios of B→D1lν and [Formula: see text] can be understood in the framework of HQEFT.