[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7839
Exact Light-Cone Wavefunction Representation of Matrix Elements of Electroweak Currents
Abstract
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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