Search for rare hadronic B decays

A search for rare decays of B hadrons has been performed using approximately two million hadronic Z0 decays collected by the OPAL experiment between 1990 and 1993. The exclusive decay channels Bd0 → π+ π−, Bd0 → K+π−, Bs0 → π+K− and Bs0 → K+K− have been studied. Such decays include contributions from flavour changing neutral current processes such as hadronic penguin decays. No significant excess of events has been observed in the π+π−, π+K− …