At present, the gauge symmetry of the standard model is nothing
more than an empirical fact.
We can imagine a larger symmetry governing the world.
The larger symmetry implies the existence of new matter particles
and new gauge particles.
The extra-Z boson is such a particle and is easy to find, if
it is in the energy region of JLC.
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webmaster@www-jlc.kek.jp Feb 09, 1995