Study of Colour-Suppressed Bs Decays in Belle

Full text: Mesons containing the heavy fifth quark b (called 'bottom' or 'beauty') are of particular interest for investigations of the Standard Theory and beyond. Decays of these mesons are studied in the Belle detector at the 'Beauty Factory' KEKB, an asymmetric e-e+ collider at the KEK Laboratory in Tsukuba, Japan. Tuning the collider to a center-of-mass energy of 10.86 GeV opens the resonant production of the (b anti-b) vector-meson Y5S, decaying into Bs(*) + anti-Bs(*) pairs of mesons composed of a b and an s ('strange') quark-antiquark. Object of this study are the exclusive decays Bs→J/ψ Φ, Bs→J/ψ Ks and Bs→ D0 Ks which are colour-suppressed (in addition to being Cabibbo-suppressed). We present the experimental environment (KEKB accelerator and Belle detector), the data samples (more than 100 fb-1 have been collected in 2005 - 09), and techniques based on Monte Carlo simulation for extracting the signal events from the background. (author)