BOUNDS ON ANOMALOUS 3-GAUGE BOSON COUPLINGS FROM THE HEAVY ZB(B)OVER-BAR VERTEX

We derive bounds on anomalous ZWW couplings, assuming that the residua l apparent small discrepancy between the experimental and the MSM valu es of the ratio R(b)=Gamma(b)/Gamma(h) of the Z widths into b ($) over bar b and into hadrons is entirely due to the ''heavy'' quark compone nt of the Zb ($) over bar b vertex. The m(1)(2) dependence of this qua ntity selects the Goldstone H-+/- (or longitudinal W-+/-) components o f the anomalous couplings, and greatly reduces the number of involved parameters. For ii of order 1 TeV we find the conservative 1 - sigma b ound - 0.40 less than or similar to(f(Q)M(Z)(2)/2 Lambda(2)-0.04f(B)M( Z)(2)/2 Lambda(2))less than or similar to-0.15, that would lead to obs ervable effects at LEP2.