Abstract
We show that heavy-quark production via W-italic-gluon fusion in high-energy p-italicp-italic and p-barp-italic collisions is an important source of the heavier member of an SU(2)/sub L-italic/ doublet of quarks if the mass splitting within the doublet is large. W-italic-gluon fusion exceeds the strong production of heavy quarks for mass splittings greater than 300--350 GeV at ..sqrt..s-italic = 10 TeV and 400--450 GeV at ..sqrt..s-italic = 40 TeV. An alternative way to regard W-italic-gluon fusion is as the production of the heavier quark by fusing its light partner with a W-italic boson. We use a distribution function for the light partner to show that this process gives results which agree qualitatively with W-italic-gluon fusion. We also discuss the Drell-Yan production of an SU(2)/sub L-italic/ doublet of heavy quarks via a virtual W-italic boson and corrections to this process from initial gluons. We find that at the Fermilab Tevatron energy ..sqrt..s-italic = 2 TeV, W-italic-gluon fusion exceeds the Drell-Yan production of top quarks for masses above 100 GeV.
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