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Exact Light-Cone Wavefunction Representation of Matrix Elements of Electroweak Currents


The matrix elements of electroweak currents which occur in exclusive decays of heavy hadrons are evaluated in the nonperturbative light-cone Fock representation. In general, each semileptonic exclusive decay amplitude receives two contributions, a diagonal delta n = 0 parton-number-conserving amplitude and a delta n = -2 contribution in which a quark and an antiquark from teh initial hadron Fock state annihilate to the leptonic current. The general formalism can be used as a basis for systematic approximations to heavy hadron decay amplitudes such as hard perturbative QCD contributions. We illustrate the general formalism using a simple perturbative model of composite hadrons. Our analysis demonstrates the occurence of "zero-mode" end-point contributions to matrix elements of the "bad" j- currents in the Drell-Yan frame q+ --> 0.

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