STUDYING THE TOP-QUARK VIA THE W-GLUON FUSION PROCESS

We show that studying the single top quark production via the W-gluon fusion process can provide unique information on: (i) the measurement of the decay width GAMMA(t-->bW+); (ii) probing the symmetry breaking mechanism by measuring the form factor of t-b-W;(iii) testing the effective- W approximation prior to supercolliders; (iv) testing CP violation by observing different production rates of ppBAR-->tX and ppBAR-->tXBAR, (v) testing CP violation from the almost hundred percent longitudinally polarized top quark decay; in addition to the measurement of the top quark mass. In contrast to the recent claim by R.K. Ellis and S. Parke, we show that this process is extremely useful at the Tevatron. With appropriate kinematic cuts, we find there are about 10 top or anti-top events (including the W branching ratio into e or mu) from this process produced at the Tevatron with 100 pb-1 luminosity, square-root S = 1.8 TeV and 50% efficiency for tagging a b-quark.