Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-17
Nucl.Phys. A660 (1999) 219-231
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages,include 5 figures (lfcxx.eps, lfczx.eps,lfczz.eps, lfcagg.eps and lfcaqq.eps), use latex,epsf,elsart, e-mail: pache
Scientific paper
10.1016/S0375-9474(99)00371-1
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.
de Melo P. B. C. J.
Frederico Tobias
Naus H. W. L.
Sauer Peter U.
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