Faithin Omaha eBook Collection

Download or read book Measurement of the Bs Anti-Bs Oscillation Frequency Using Semileptonic Decays written by and published by . This book was released on 2007 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports a time dependent measurement of the B°{sub s}-{bar B}°{sub s} oscillation frequency [Delta]m{sub s} using semileptonic decays B°{sub s} → D−{sub s}l+X. We use a data sample of 1 fb−1 of p{bar p} collisions at √s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron Collider to reconstruct ≈ 61, 500 semileptonic B°{sub s} decays. This analysis of B°{sub s}-{bar B}°{sub s} mixing has a sensitivity of 19.4 ps−1 and shows an evidence of B°{sub s} oscillations at [Delta]m{sub s} ≈17.75 ps−1 with an amplitude significance of ≈2. In combination with the analyses of ≈ 8,700 hadronic B°{sub s} decays at CDF, we have made the first direct observation of time-dependent B°{sub s}-{bar B}°{sub s} flavor oscillations measuring [Delta]m{sub s} = 17.77 {sup +0.09}{sub -0.10} (stat) ± 0.07 (syst) ps−1. The obtained value of [Delta]m{sub s} agrees with the Standard Model expectation. When combined with the world average values for [Delta]m{sub d}, m{sub {bar B}0} and m{sub {bar B}0s}, along with other theoretical input, this result yields the ratio of CKM matrix elements.