Constraints on Gauged B-3Ltau and Related Theories
Abstract
We consider extensions of the Standard Model with an extra U(1) gauge boson which couples to B-(alpha Le + beta Lmu + gamma Ltau) with alpha + beta + gamma = 3. We show that the extra gauge boson necessarily mixes with the Z leading to potentially significant corrections to the Z-f-fbar vertex. The constraints on the size of this correction imposed by the Z-pole data from LEP and SLD are derived.
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