An effective field theoretic description of the Isgur-Wise function in heavy-meson transitions is presented which emulates soft interactions by a fermion worldline with an infinitesimal self-intersecting loop. A point-splitting regularization technique is used, which replaces pointlike worldlines by ``ribbons'' in the sense of Witten. The calculated vertex function is correctly normalized, does not depend on the heavy-quark mass, and complies with different sets of recent experimental data of the ARGUS and CLEO collaborations.
- Pub Date:
- October 1996
- High Energy Physics - Phenomenology
- LaTeX, using Worldstyle and comprising three eps files (5 pages in total). Invited talk presented by the first author at the International Workshop Quark Confinement and the Hadron Spectrum II, June 26-29, 1996, Villa Olmo, Como, Italy. To appear in the Proceedings (World Scientific)