Wilson Hall, the central laboratory building at the heart of the Fermilab site. Photo: Reidar Hahn/Fermilab
When the results of an experiment don’t match predictions made by the best theory of the day, something is off.
Fifteen years ago, physicists at Brookhaven National Laboratory discovered something perplexing. Muons – a type of subatomic particle – were moving in unexpected ways that didn’t match theoretical predictions. Was the theory wrong? Was the experiment off? Or, tantalisingly, was this evidence of new physics?
Physicists have been trying to solve this mystery ever since.
I am a theoretical physicist and the spokesperson and one of two coordinators of the