Phenomenological profiles of the inclusive hadron spectra in the decay B -> X(s)l(+)l(-) - art. no. 034017.

Hadron spectra and hadronic moments in the decay B --> X(s)l(+)l(-) are cal culated taking into account both the short-distance and long-distance contr ibutions in the decay amplitude using a Fermi motion (FM) model to incorpor ate the B-meson wave-function effects. The measured branching ratios for th e inclusive decays B --> X-s + (J/psi, psi',...) --> X(s)l(+)l(-) are used to fix the normalization of the long-distance contribution. Assuming factor ization, the momentum distribution of the J/psi measured by the CLEO Collab oration is fitted in the FM model which is then used to calculate the hadro nic spectra from the resonant contribution also away from the J/psi resonan ce. We also study the effect of various descriptions of the resonant and no nresonant c (c) over bar contributions in B --> X(s)l(+)l(-) existing in th e literature on the hadron energy and invariant mass spectra, and in the fo rward-backward asymmetry. Selective cuts on the hadron and dilepton invaria nt masses can be used to reduce the B (B) over bar background and resonant contribution and, as an example, we work out the hadron spectra with the ex perimental cuts used by the CLEO Collaboration in searching for the decay B --> X(s)l(+)l(-). We show that data from the forthcoming B facilities coul d be used effectively to measure the short-distance contribution in B --> X (s)l(+)l(-), enabling precise determination of the FM model parameters as w ell as the heavy quark effective theory parameters lambda(1) and <(Lambda)o ver bar>. [S0556-2821(99)04413-6].