Search for New Physics in the Bs Sector at the Tevatron

At the Tevatron B s mesons are copiously produced in pp̄ collisions at a center of mass energy of √ s = 1.96 TeV. Having recorded datasets corresponding to an integrated luminosity of more than 5 fb, the two Tevatron experiments CDF and D0 are able to perform detailed studies of B s mesons. Essential for these analyses are triggers that efficiently select events with B s mesons. They are identified by decays to J/ψ mesons with J/ψ → μμ, semileptonic decays to muons (D0), or hadronic decays with a displaced decay vertex (CDF). The B s mesons are a promising place to search for physics beyond the Standard Model (SM) because several flavor changing neutral current (FCNC) processes can be measured in the B s system. As there are no FCNC processes at tree level in the SM, new physics contributions may be sizable. Two rare FCNC decay modes of the B s that are analyzed at the Tevatron are B s → μμ and B s → μμφ. Another interesting FCNC process is the oscillation of B s mesons. It is described by a Schrödinger equation