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We present a study of $W+$multijet events that compares the kinematics of theobserved events with expectations from direct QCD $W+$jet production and fromproduction and decay of top quark pairs. The data were collected in the 1992-93run with the Collider Detector at Fermilab from 19.3 pb$^{-1}$ of proton-antiproton collisions at $\sqrt{s}=1.8$ TeV. From the $W+\geq 3$ jet events, a"signal sample" with an improved ratio of $t \bar{t}$ to QCD produced $W$events is selected by requiring each jet to be emitted centrally in the eventcenter of mass frame. This sample contains 14 events with unusually hard jetE$_T$ distributions not well described by expectations for jets from direct QCD$W$ production and other background processes. Using expected jet E$_T$distributions, a relative likelihood is defined and used to determine if anevent is more consistent with the decay of $t \bar{t}$ pairs, with M$_{top}$~=~170 GeV/c$^2$, than with direct QCD $W$ production, while only 1.7 suchtop--like events are expected in the absence of $t \bar{t}$. Good agreement inthe jet spectra is obtained if jet production from $t \bar{t}$ pair decays isincluded. For those events kinematically more consistent with $t \bar{t}$ wefind evidence for a $b$-quark content in their jets to the extent expected fromtop decay, and larger than expected for background processes. For events withfour or more jets, the discrepancy with the predicted jet energy distributionsfrom direct QCD $W$ production, and the associated excess of $b$-quark contentis more pronounced.Comment: 45 pages (Latex), 17 uuencoded Postscript figures, correction of  abstrac

Kinematic evidence for top quark pair production inW+multijet events inpp¯collisions at √s=1.8 TeV