Unitarization of gluon exchange amplitudes and rapidity gaps at the Fermilab Tevatron

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Abstract
Rapidity gaps between two hard jets at the Fermilab Tevatron have been interpreted as being due to the exchange of two gluons which are in an overall color-singlet state. We show that this simple picture involves unitarity violating amplitudes. Unitarizing the gluon exchange amplitude leads to qualitatively different predictions for the fraction of t-channel color singlet exchange events in forward qq, qg or gg scattering, which better fit Tevatron data.
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