CP Violation in {B_s}^0 > J psi.phi Decays 87 The power of number was 70174 Stuttgart The power of number was an idea the En lightenment thinkers deployed with their legendary passion and vigor Combining both historical and systematic studies from various angles Measured with the Collider Detector at Fermilab The phase difference between transition amplitudes (“mixing phase”) is observable and extremely sensitive to contributions from non standard model particles or interactions that may be very hard to detect otherwise – a fact that makes the precise measurement of the B_s mixing phase one of the most important goals of particle physics