Semileptonic decays of heavy mesons

Details Semileptonic decays of heavy mesons Semileptonic decays of heavy mesons

1997-04-17

arxiv.org/abs/nucl-th/9704039v1

Phys.Lett.B416:29-35,1998

Physics

Nuclear Physics

Nuclear Theory

11 pages, LaTeX, epsfig.sty, elsart.sty

Scientific paper

10.1016/S0370-2693(97)01323-3

The semileptonic and leptonic decays of heavy mesons are studied as a phenomenological application and exploration of a heavy-quark limit of Dyson-Schwinger equations. The single form factor, $\xi(w)$, which characterises the semileptonic decay in this limit, is calculated and compares well with recent experimental extractions. We obtain a lower bound of 1/3 on the slope-parameter $\rho^2 \equiv -\xi^\prime(1)$, which, in calculations with realistic input, is exceeded by a great deal: agreement with experimental data requiring $\rho^2 \sim 1.2 - 1.6$. The flavour and momentum dependence of the light-quark propagators has observable consequences.

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