Covariance of Light-Front Models: Pair Current

Abstract

We compute the "+" component of the electromagnetic current of a composite spin-one two-fermion system for vanishing momentum transfer component $q^{+}=q^0+q^3$. In particular, we extract the nonvanishing pair production amplitude on the light-front. It is a consequence of the longitudinal zero momentum mode, contributing to the light-front current in the Breit-frame. The covariance of the current is violated, if such pair terms are not included in its matrix elements. We illustrate our discussion with some numerical examples.

17 pages,include 5 figures (lfcxx.eps, lfczx.eps,lfczz.eps, lfcagg.eps and lfcaqq.eps), use latex,epsf,elsart, e-mail: [email protected], [email protected], [email protected], [email protected], Accepted in Nucl.Phys. A (1999)

References in corpus (2)

• Pairs in the light-front and covariance
• Nonvanishing zero modes in the light-front current

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