2004/08/25 by K. Abe, 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
paper · pdf · doi:10.48550/arxiv.hep-ex/0408131
openalex publication_date 2004/08/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report measurements of B to pseudoscalar-pseudoscalar decays with at least one eta meson in the final state using 140 fb-1 of data collected by the Belle detector at KEKB e+ e- collider. We observe the decays of B+-> eta pi+ and B+-> eta K+; the measured branching fractions are Br(B+-> eta pi+) = (4.8+0.8-0.7(stat) +- 0.3 (sys)) * 10-6 and Br(B+-> eta K+) = (2.1 +- 0.6 (stat) +- 0.2 (sys)) * 10-6. Their corresponding CP violating asymmetries are measured to be 0.07 +- 0.15 +- 0.03 for eta pi+- and -0.49 +- 0.31 +- 0.07 for eta K+-. No significant signals are found for neutral B meson decays. We report the following upper limits on branching fractions at the 90% confidence level: Br(B0 -> eta K0) < 2.0 * 10-6, Br(B0-> eta pi0) < 2.5 * 10-6 and Br(B0 -> eta eta) < 2.0 * 10-6.