Abstract
The phenomenological constraints from neutral-current experiments, the W and Z masses, and direct searches at the S p pS collider on the masses and mixing of theoretically motivated extra Z bosons are considered. Particular consideration is given to the additional bosons expected in grand unified theories based on SO 10 and E 6 (including superstring models) and in models with a low energy left-right symmetry. It is found that the existing constrainsts are very weak, with masses as low as 100–300 GeV allowed for the various cases considered.
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