1/m1/m Corrections for Orbitally Excited Heavy Mesons and the 1/21/2 - 3/23/2 Puzzle

We re-investigate the effects of the $1/m_c$ corrections on the spectrum of the lowest orbitally excited $D$-meson states. We argue that one should expect the $1/m_c$ corrections to induce a significant mixing between the two lowest lying $1^+$ states. We discuss the implications of this mixing and compute its effect on the semileptonic decays $B \to D^{**} \ell \bar{\nu}$ and the strong $D^{**}$ decays.Comment: 9 pages, 3 figure

Inclusive semitauonic B decays to order O(ΛQCD3/mb3)

We calculate the decay width and the τ-lepton energy distribution as well as relevant moments for inclusive B¯→Xcτν¯τ process including power corrections up to order ΛQCD3/mb3 and QCD corrections to the partonic level. We compare the result with the sum of the standard-model predictions of the branching fractions of the exclusive semileptonic B¯→(D,D⁎,D⁎⁎)τν¯τ decays as well as with the relevant experimental data. Our prediction is in agreement with the LEP measurement and is consistent with the standard-model calculation of the exclusive modes. We discuss the impact from physics beyond the Standard Model