Signatures of Exotic Fermions and Other New ''Low-Energy'' Phenomena in Superstring E sub 6

摘要

Superstring theories have drawn renewed attention to the exceptional group E sub 6 as a grand unified theory. We discuss the extra U(1) symmetries (beyond that in the standard SU(3) x SU(2) x U(1) model) that arise when E sub 6 is broken in such theories. These extra U(1)'s must lead to at least one extra neutral gauge boson, called Z', for which we give mass limits and branching ratios. Neutral current effects of this Z' and its direct production are discussed briefly. Finally, some signatures are noted of exotic fermions to which Z' can decay. (ERA citation 12:014674)