Abstract
We demonstrate that the form factors can be accurately predicted given the slope parameter of the Isgur-Wise function. Only weak assumptions, consistent with lattice results, on the wave function for the light degrees of freedom are required to establish this result. We observe that the QCD and corrections can be systematically represented by an effective Isgur-Wise function of shifted slope. This greatly simplifies the analysis of semileptonic B decay. We also investigate what the available semileptonic data can tell us about lattice QCD and heavy quark effective theory. A rigorous identity relating the form factor slope difference to a combination of form factor intercepts is found. The identity provides a means of checking theoretically evaluated intercepts with experiment.
- Received 15 September 2000
DOI:https://doi.org/10.1103/PhysRevD.63.032006
©2001 American Physical Society