The D0 collaboration has performed a study of spin correlation in t (t) ove
r tilde production for the process t (t) over bar --> bW(+)(b) over bar W-,
where the W bosons decay to e nu or mu nu. A sample of six events was coll
ected during an exposure of the DO detector to an integrated luminosity of
approximately 125 pb(-1) of root s = 1.8 TeV p (p) over bar collisions. The
standard model (SM) predicts that the short lifetime of the top quark ensu
res the transmission of any spin information at production to the t (t) ove
r bar decay products. The degree of spin correlation is characterized by a
correlation coefficient kappa. We find that kappa > -0.25 at the 68% confid
ence level. in agreement with the SM prediction of kappa = 0.88.