2021/09/22 by Belle II collaboration, Belle II Collaboration, F. Abudinén +648
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle Accelerators and Free-Electron Lasers #Particle Detector Development and Performance #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2109.10807
openalex publication_date 2021/09/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/02
We report on measurements of branching fractions (B) and CP-violating charge asymmetries (A\rm CP) of multibody charmless B decays reconstructed by the Belle II experiment at the SuperKEKB electron-positron collider. We use a sample of collisions collected in 2019 and 2020 at the Υ(4S) resonance and corresponding to 62.8 fb-1 of integrated luminosity. We use simulation to determine optimized event selections. The ΔE and M\rm bc distributions of the resulting samples are fit to determine signal yields of approximately 690, 840, and 380 decays for the channels B+ → K+K-K+, B+ → K+π-π+, and B0 → K+π-π0, respectively. These yields are corrected for efficiencies determined from simulation and control data samples to obtain B(B+ → K+K-K+) = [35.8 ± 1.6(\rm stat) ± 1.4 (\rm syst)]× 10-6, B(B+ → K+π-π+) = [67.0 ± 3.3 (\rm stat)± 2.3 (\rm syst)]× 10-6, B(B0 → K+π-π0) = [38.1 ± 3.5 (\rm stat)± 3.9 (\rm syst)]× 10-6, A\rm CP(B+ → K+K-K+) = -0.103 ± 0.042(\rm stat) ± 0.020 (\rm syst), A\rm CP(B+ → K+π-π+) = -0.010 ± 0.050 (\rm stat)± 0.021(\rm syst), and A\rm CP(B0 → K+π-π0) = 0.207 ± 0.088 (\rm stat)± 0.011(\rm syst). Results are consistent with previous measurements and demonstrate detector performance comparable with the best Belle results.