Tevatron sees new particle?

Not only is Fermilab not going silently into the night, in the face of competition from the LHC, it may have actually produced a new particle, as yet unknown to physics. Experiments colliding up quarks and anti-up quarks in the Tevatron have produced anomalous muons, which Fermilab can't explain.

Source: http://arxiv.org/abs/0810.5357