2001/05/14 by H. Tajima, Belle Collaboration, Tajima, H.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0105024
5 pages, 3 figues. Proceedings for XXXVIth Rencontres de Moriond session devoted to QCD and High Energy Hadronic Interactions
arxiv created 2001/05/14 · arxiv updated 2009/11/30
Recent results on the B CP-violation parameter sin2ϕ1, the B0d-B0d mixing parameter Δmd and B-meson lifetimes are reported. The results are based on 10.5 fb-1 of data collected with the Belle detector at KEKB. Using both semileptonic and hadronic decay modes the neutral and charged B-meson lifetimes are measured to be \taubz=1.548±0.035 (stat.)~ps and \taubm=1.656±0.038 (stat.)~ps. The oscillation frequency Δmd for B0d-B0d mixing is measured to be 0.522±0.026 (stat.)~ps-1 using semileptonic modes and 0.527±0.032 (stat.)~ps-1 using hadronic modes. The above results are preliminary. The time evolution of B0d decays into J/ψK0S, ψ(2S) K0S, χc1 K0S, ηc K0S, J/ψK0L and J/ψπ0 modes are studied to obtain sin2ϕ1. Using 282 fully reconstructed events, sin2ϕ1 is measured to be sin 2ϕ1=0.58+0.32-0.34 (stat.)+0.09-0.10 (syst. ).