2008/03/24 by Belle Collaboration
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.0803.3375
8 pages, 4 figures, 4 tables. Contributed to Rencontres de Moriond EW 2008
arxiv created 2008/03/24 · openalex publication_date 2008/03/24 · arxiv updated 2012/08/27 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28
We present an updated measurement of the unitarity triangle angle phi3 using a Dalitz plot analysis of the K0S pi+ pi- decay of the neutral D meson produced in B+- ->D(*)K+- decays. The method exploits the interference between D0 and Dbar0 to extract the angle phi3, strong phase delta and the ratio r of suppressed and allowed amplitudes. We apply this method to a 605 fb-1 data sample collected by the Belle experiment. The analysis uses two modes: B+- -> DK+-, and B+- -> D*K+- with D* -> D pi0, as well as the corresponding charge-conjugate modes. From a combined maximum likelihood fit to the two modes, we obtain phi3=76+12-13(stat)+-4(syst)+-9(model). The statistical significance of CP violation (phi3≠ 0) in our measurement is (1-5.5*10-4), or 3.5 standard deviations. These results are preliminary.