Wednesday 02 December 2009, held at University of Southampton, as part of NeXT meeting Speaker: Joe Boudreau (University of Pittsburgh) Title: CP Violation in B^0_s mesons at the Tevatron Experiments Abstract: For the time being the CDF and D0 experiments at the Tevatron are the worlds only high-statistics source of B^0_s mesons. This system is interesting to study, first because of its phenomenological richness, but also because of its sensitivity to new particles that are not yet directly accessible at today's collider experiments. CP violation in this system appears as a combination of two familiar phenomena: CP asymmetries (as in the B^0 -> J/\psi K^0_s decays) and forbidden transitions (as in the K^0 system). Recent measurements of the CP violation parameter \beta_s (an angle of the "squashed" unitarity triangle, which applies to the B^0_s system) have shown small deviations from the standard model, at the level of 2.2 sigma. This talk will summarize the current situation at the Tevatron experiments.