Speaker
Mr
Dominik Horn
(University of Karlsruhe)
Description
Under certain theoretical assumptions, the branching fraction of Bs → Ds+(*) Ds-(*) is directly sensitive to the relative decay width difference DeltaGamma_CP/Gamma in the Bs system, which is predicted to be sizable in the standard model. Using approx. 4 fb-1 of data collected by the CDF II detector at the Tevatron ppbar collider, we are currently performing an exclusive selection of Bs → Ds+(*) Ds-(*) signal candidates in several hadronic modes. In contrast to former branching fraction measurements of this decay, we will be able to disentangle Bs → Ds+(*) Ds-(*) and measure the branching fractions of Bs → Ds+ Ds-, Bs → Ds+* Ds-, and Bs → Ds+* Ds-* separately.
Yet another interesting mode is the decay of the Bs into a phi pair: this is a vector-vector decay dominated by b→sss penguin transition which is a sensitive probe for possible new physics effects. The only existing sample of this mode was reconstructed by the CDF experiment from 0.2 fb-1 of data, and consisted of only 8 signal events. Here we present new results based on a clean sample of about 300 Bs → phi phi decays reconstructed by the CDF II detector in a dataset with an integrated luminosity of about 3 fb-1.
Primary author
Mr
Dominik Horn
(University of Karlsruhe)
