Effective lagrangian for heavy and light mesons. Semileptonic decays
Abstract
We introduce an effective lagrangian including negative and positive parity heavy mesons containing a heavy quark, light pseudoscalars, and light vector resonances, with their allowed interactions, using heavy quark spin-flavour symmetry, chiral symmetry, and the hidden symmetry approach for light vector resonances. On the basis of such a lagrangian, by considering the allowed weak currents and by including the contributions from the nearest unitarity poles we calculate the form factors for semileptonic decays of B and D mesons into light pseudoscalars and light vector resonances. The available data, together with some additional assumptions, allow for a set of predictions in the different semileptonic channels, which can be compared with those following from different approaches. A discussion of non-dominant terms in our approach, which attempts at including a rather complete dynamics, will however have to wait till more abundant data become available.
- Publication:
-
Physics Letters B
- Pub Date:
- January 1993
- DOI:
- 10.1016/0370-2693(93)90895-O
- arXiv:
- arXiv:hep-ph/9211248
- Bibcode:
- 1993PhLB..299..139C
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- LaTeX (style article), 19 pages, UGVA-DPT 1992/11-790, BARI-TH/92-125