First measurements of the φ<inf>3</inf>-sensitive decay B^± → D(K<inf>S</inf>⁰Ï€⁺Ï€^−π⁰)K^± with Belle

The current experimental uncertainty on the CKM unitarity triangle angle φ3 is significantly larger than that on the standard model prediction. A more precise measurement of φ3 is crucial for testing the SM description of CP violation and probing for new physics effects. The precision can be improved by exploring new B and D decay modes. The first model-independent measurement of the CKM angle φ3 using B± → D(KS0π+π−π0)K± decays is presented here. The GGSZ method is used by binning the five-dimensional phase space of the D decay. This analysis uses the measurement of the average strong-phase differences across the phase space in D → KS0π+π−π0 decays from CLEO-c, as input. The results are obtained from the full Belle data set with an integrated luminosity of 711 fb−1 collected at the ϒ(4S) resonance.