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Covariance of Light-Front Models: Pair Current

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arxiv hep-ph/9908384 v1 pith:YHYZQ5BW submitted 1999-08-17 hep-ph nucl-th

classification hep-phnucl-th
keywords currentlight-frontpaircomponentcovariancemomentumamplitudebreit-frame
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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.

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  1. Covariant analysis of electromagnetic current on the light cone: exposition with scalar Yukawa theory

    hep-ph 2025-01 conditional novelty 6.0 of 10

    Adding an antinucleon Fock component, even at only ~2% probability, dramatically reduces the frame dependence of the charge form factor in strongly coupled scalar Yukawa theory on the light front.

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