2004/08/23 by K. Abe, Belle Collaboration, Abe, K.
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.hep-ex/0408104
15 pages, 4 figures, 4 tables, submitted to ICHEP2004, Beijing, China
openalex publication_date 2004/08/23 · arxiv created 2004/10/18 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
An angular analysis for B decays into two vector mesons gives parameters sensitive to new physics. They are the decay amplitudes of the three helicity states, the asymmetry in triple product, and the CP violating phase. The measurements of these quantities are performed for B0 → J/ψK*0 decays in a data sample with 253 fb-1 taken by the Belle detector in the KEKB asymmetric e+e- collider. With the time-integrated angular analysis, the decay amplitudes' moduli and phase angles are measured to be |A0|2=0.585± 0.012 ± 0.09, |A∥|2=0.233± 0.013± 0.008, |A_⊥|2=0.181± 0.012± 0.008, arg(A_∥)=2.888± 0.090± 0.008 radians, and arg(A_⊥)=0.239± 0.064± 0.010 radians. The difference between arg(A_∥) and arg(A_⊥) is 2.649±0.110 radians, which is shifted from π by more than 4σ; this can be interpreted as evidence for the existence of the final state interaction. The amplitude values are used in triple product correlations to obtainasymmetries of AT(1)=0.101± 0.033± 0.007 and AT(2)=-0.102± 0.032± 0.003 for B0 meson decays, and AT(1)=0.056± 0.030± 0.006 and AT(2) = -0.091± 0.028± 0.003 for B0 meson decays. The time dependent angular analysis gives the measurements of CP violating parameters sin 2ϕ1 and cos 2ϕ1 to be 0.30 ± 0.32 ± 0.02 and -0.31 ± 0.91 ± 0.10, respectively. The value of cos 2ϕ1 is -0.56 ± 0.86 ± 0.11 if sin 2ϕ1 is fixed at the world average value (0.731).