Experimental HEP Seminar

Evidence of an Asymmetry in B Meson Matter-Antimatter Oscillations

Wendy Taylor

York University

After the Big Bang, the temperature of the universe cooled sufficiently for massive particles to coalesce. It is believed that matter and antimatter particles were created in equal proportions but some physical process has preferentially consumed the antimatter, leaving a matter-dominant universe. Violation of the charge-parity symmetry (CPV) could be that process. The Standard Model (SM) of Particle Physics naturally predicts CPV effects in flavour oscillations but at a rate insufficient to explain the observed matter-antimatter imbalance. I will present new evidence from the DZero experiment at the Fermilab Tevatron 2-TeV proton-antiproton collider of CPV effects in neutral B meson oscillations about two orders of magnitude larger than the SM prediction.