Although I have not yet defined what I mean by half the terms
in Table 1.5, this is a convenient place
to summarize the known and hypothetical interactions of matter.
It is conventional to group ``superweak''
together with the electroweak interaction (which ``unifies''
the weak and electromagnetic forces)
and to put ``superstrong'' and ``ultrastrong''
in with the strong interaction so that you should not
be surprised to hear that there are only three
``official'' forces - gravity, electroweak and strong.
However, there is a certain amount of freedom in semantics here....
Table:
Interactions of the elementary particles.
A ``yes'' means that the types of particle indicated at the left
are directly coupled to the force above; ``no'' means the opposite;
three asterisks (
) means that the particle in question
is the intermediary for that force.