F. Abe et al., SEARCH FOR FLAVOR-CHANGING NEUTRAL-CURRENT DECAYS OF THE TOP-QUARK INP(P)OVER-BAR COLLISIONS AT ROOT-S = 1.8 TEV, Physical review letters, 80(12), 1998, pp. 2525-2530
We search for the flavor-changing neutral current decays of the top qu
ark t --> q gamma and t --> qZ (here q represents the c and u quarks)
in (p) over bar p collisions at root s = 1.8 TeV. We use a dataset (in
tegral L dt similar to 110 pb(-1)) collected during the 1992-1995 run
of the Collider Detector at Fermilab. We set 95% confidence level limi
ts on the branching fractions B(t --> q gamma) < 3.2% and B(t --> qZ)
< 33%, consistent with the standard model.