Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
HIGH-ENERGY PHYSICS: Muon Measurements Muddle a Model
Charles Seife
Scientists at Brookhaven National Laboratory have confirmed earlier evidence of a discrepancy between the Standard Model of particle physics and the "magnetic moment" of the muon. Physicists are still debating just how significant the mismatch is.