  We study the collision of two particles in the Teo wormhole spacetime, in
which the wormhole is stationary and axisymmetric. We show that a non-rotating
Teo wormhole cannot be a particle accelerator, while a rotating Teo wormhole
can be used to accelerate particles and create high energy collisions because
of the deep effective potential of the colliding particles. The process is
different from that in the vicinity of a near-extremal black hole, since here
there is no event horizon. This is the first example of particle collision with
high center-of-mass energy in a spacetime with no event horizon, no naked
singularity, and not being extremal in a clear sense. The process can unlikely
have direct implications for astrophysical observations, but it is interesting
as a tool to investigate wormhole instabilities.
