Induced Neutral Current Effects in Unified Models of Weak and Electromagnetic Interactions

We present estimates of the amplitudes for the reactions ${\nu }_{\mu }+e\to {\nu }_{\mu }+e$ and $\nu +p\to \nu +p$ in the models of Georgi and Glashow, and of Lee, Prentki, and Zumino. In these renormalizable models of weak and electromagnetic interactions, the above processes arise only in second order. The amplitudes are of the order $G_F\alpha$: They are neither enhanced nor suppressed.