Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-

Abstract

The suppressed decay chain BDK, D K, where D indicates a D0 or D0 state, provides important information on the CP-violating angle 3. We measure the ratio RDK of the decay rates to the favored mode B DK D K to be RDK syst1 0 2, which indicates the first evidence of the signal with a significance of 4 1. We also measure the asymmetry ADK between the charge-conjugate decays to beADK The results are based on