Abstract

We examine the possible influence of additional heavy neutral gauge bosons (Z/sub 1//sup 0/) on attempts at neutrino counting in e/sup +/e/sup -/ annihilation below the Z/sub 1//sup 0/ (approx. =93 GeV) resonance. A large class of two-Z/sup 0/-boson models is examined. We find that the apparent shift in the number of neutrinos, N/sub ..nu../, due to the extra Z/sup 0/ boson in these models is never larger than approx. =0.4 if N/sub ..nu../ = 3 and somewhat smaller if N/sub ..nu../ = 4. Thus we should not expect a large ''error'' in neutrino counting to result in these extensions of the standard model.

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