Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Study of Bs → Ds+(*) Ds-(*) and Bs → phi phi Decays at CDF II

Jul 16, 2009, 3:20 PM
Large Lecture - Hall A (Kraków, Poland)

Large Lecture - Hall A

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Flavour Physics II. Flavour Physics


Mr Dominik Horn (University of Karlsruhe)


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)

Presentation materials