Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-19
Int.J.Mod.Phys. A16 (2001) 2505-2532
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, RevTex, 4 figures, 3 tables, to be published in IJMPA
Scientific paper
10.1142/S0217751X01003627
Exclusive semileptonic B decays into excited charmed mesons ($D_1$, $D^*_2$) are studied up to the order of $1/m_Q$ in the framework of the heavy quark effective field theory (HQEFT), which contains the contributions of both particles and antiparticles. Two wave functions $\eta^b_0$ and $\eta^c_0$, which characterize the contributions from the kinematic operator at the order of $1/m_Q$, are calculated by using QCD sum rule approach in HQEFT. Zero recoil values of other two wave functions $\kappa'_1$ and $\kappa'_2$ are extracted from the excited charmed-meson masses. Possible effects from the spin-dependent transition wave functions which arise from the magnetic operators at the order of $1/m_Q$ are analyzed. It is shown that the experimental measurements for the branching ratios of $B \to D_1 l\nu$ and $B \to D^*_2 l\nu$ can be understood in the framework of HQEFT.
Wang Wan-Ying
Wu Yue-Liang
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