Physics – High Energy Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iche.conf.1133c&link_type=abstract
HIGH ENERGY PHYSICS, ICHEP 2004. Proceedings of the 32nd International Conference. Held 16-22 August 2004 in Beijing, China. Edi
Physics
High Energy Physics
Scientific paper
We report measurements of two-body and three-body charmless hadronic B decays with at least one η meson in the final state. These results are obtained from a 140 fb-1 data sample collected at Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. In B to pseudoscalar-pseudoscalar (PP) decays, we have observed B+ → ηπ+ and B+ → K+ but no significant signals are found for neutral B meson decays. Significant signals are observed for the pseudoscalar-vector (PV) modes, B → ηK* and B+ → ηρ+ with branching fractions larger than the pseudoscalar-pseudoscalar modes. Flavor specific CP violating asymmetries for the observed decays are also reported. Large signals are observed for the inclusive three-body decays with measured branching fractions B(B0 -> ηK +π ^-) = ( 3 3.43.33.5(stat)_-1.9^+2.1(syst)) × 10-6 and B(B0 -> πK +π ^-) = (16.6-3.23.5(stat)_-1.0^+1.4(syst)) × 10-6. Further study shows that the dominant contribution for B0 → ηK+π- is the intermediate two-body states while in B0 → ηK+π- the event topology is more phase-space like. We also search for the possible two-body decays, Bo -> a0-K^+ and Bo -> a0-π ^+. No signals are observed and upper limits at 90% confidence level are provided.
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