Breaking the symmetry between fundamental forces

The CDF and DZero experiments at the Tevatron have published their latest measurement of the electroweak mixing angle. Photo: Reidar Hahn

At present scientists think that at the highest energies and earliest moments in time, all the fundamental forces may have existed as a single unified force. As the universe cooled just one microsecond after the Big Bang, it underwent a “phase transition” that transformed or “broke” the unified electromagnetic and weak forces into the distinct forces observed today.

By Breese Quinn and Willis Sakumoto

DZero discovers a new particle consistent with a tetraquark

A new observation of the 4-quark bound state., by Dmitri Denisov and Paul Grannis: the co-spokespersons for the DZero experiment.

Evidence for rare single-top-quark process at CDF

CDF describes their observation of a single Top quark through s-channel production., by Craig Group and Andy Beretvas.