B decays to excited charm mesons

Abstract

We review several aspects of the phenomenology of P-wave $\bar{q}Q$ mesons: mass splittings, effective strong couplings and leptonic constants. We also describe a QCD sum rule determination to order ${\alpha }_s$ of the form factor ${\tau }_{1/2}(y)$ governing the semileptonic $B$ decays to the charm doublet with $J^P=(0_{1/2}^{+},1_{1/2}^{+})$.

Comments: LaTex, 3 pages, 1 figure. Talk given at 3rd International Conference on Hyperons, Charm and Beauty Hadrons, Genoa, Italy, 30 Jun - 3 Jul 1998