Download or read book First Observation of the Decay $\bar{B}$$0\atop{s}$ {u2192} D$±\atop{s}$ K{u2213} and Measurement of the Relative Branching Fraction B($\bar{B}$$0\atop{s}${u2192} D$±\atop{s}$ K{u2213})/B($\bar{B}$$0\atop{s}${u2192} D$+\atop{s}$ ?-). written by and published by . This book was released on 2007 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the first observation of the decay $ar{B}$$0top{s}$→ D$±top{s}$ K∓ and measure the relative branching fraction of $ar{B}$$0top{s}$ → D$±top{s}$ K∓ to $ar{B}$$0top{s}$ → D$+top{s}$ ?-. The measurement of the relative branching fraction is performed by applying a fit in invariant mass and specific ionization to 1.2 fb-1 of Ds(??)X data collected with the CDF II detector in pp collisions at √ s = 1.96 TeV at the Fermilab Tevatron collider. We measure B $ar{B}$$0top{s}$ → D$±top{s}$ K∓ /B $ar{B}$$0top{s}$ → D$+top{s}$ ?- = 0.107±0.019(stat)±0.008(sys). The statistical significance of the $ar{B}$$0top{s}$ → D$±top{s}$ K∓ signal is 7.9?. To cross-check our analysis method, we also measure B $ar{B0}$→ D+K- /B $ar{B0}$ → D+?- and B $ar{B0}$ → D+*K- /B $ar{B0}$ → D*+?- and verify that our results are in agreement with the world average.