Preliminary results from two experiments suggest something could be wrong with the basic way physicists think the universe works, a prospect that has the field of particle physics both baffled and thrilled. Tiny particles called muons aren't quite doing what is expected of them in two different long-running experiments in the United States and Europe. The confounding results if proven right " reveal major problems with the rulebook physicists use to describe and understand how the universe works at the subatomic level. "We think we might be swimming in a sea of background particles all the time that just haven't been directly discovered," Fermilab experiment co-chief scientist Chris Polly said. "There might be monsters we haven't yet imagined that are emerging from the vacuum interacting with our muons and this gives us a window into seeing them." The rulebook, called the Standard Model, was developed about 50 years ago. The United States Energy Department's Fermilab announced results Wednesday of 8.2 billion races along a track outside Chicago that ... have physicists astir: The muons' magnetic fields don't seem to be what the Standard Model says they should be. This follows new results published last month from the European Center for Nuclear Research's Large Hadron Collider that found a surprising proportion of particles in the aftermath of high-speed collisions. If confirmed, the U.S. results would be the biggest finding in the bizarre world of subatomic particles in nearly 10 years.