Fermilab scientists find evidence for significant matter-
antimatter asymmetry Batavia, Ill.—Scientists of the DZero
collaboration at the Department of Energy’s Fermi National
Accelerator Laboratory announced Friday, May 14, that they have
found evidence for significant violation of matter-antimatter
symmetry in the behavior of particles containing bottom quarks
beyond what is expected in the current theory, the Standard
Model of particle physics. The new result, submitted for
publication in Physical Review D by the DZero collaboration, an
international team of 500 physicists, indicates a one percent
difference between the production of pairs of muons and pairs of
antimuons in the decay of B mesons produced in high-energy
collisions at Fermilab’s Tevatron particle collider. "This
exciting new result provides evidence of deviations from the
present theory in the decays of B mesons, in agreement with
earlier hints," said Dmitri Denisov, co-spokesperson of the
DZero experiment, one of two collider experiments at