Improved Measurements of Branching Fractions and CP Asymmetries in B-> eta h Decays

Abstract

We report improved measurements of B decays with an eta meson in the final state using 492 fb^{-1} of data collected by the Belle detector at the KEKB e^+ e^- collider. We observe the decays B^{+-}-> eta pi^{+-} and B^{+-}-> eta K^{+-}; the measured branching fractions are Br(B^{+-}-> eta pi^{+-}) = (4.2+- 0.4(stat)+- 0.2(sys))x10^{-6} and Br(B^{+-}-> eta K^{+-}) = (1.9+-0.3(stat)^{+0.2}_{-0.1}(sys))x10^{-6}. The corresponding CP-violating asymmetries are measured to be -0.23+- 0.09(stat) +-0.02(sys) for eta pi^{+-} and -0.39+-0.16(stat)+-0.03(sys) for eta K^{+-}. We also search for B^0-> eta K^0 decays and set an upper limit of 1.9x10^{-6} at the 90% confidence level.

7 pages, 3 figures

References in corpus (5)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Two body B decays with isosinglet final states in SCET
• Evidence for B-> eta' pi and improved measurements for B-> eta' K
• Measurement of branching fractions and charge asymmetries in B decays to an eta meson and a K* meson

Cited by in corpus (10)

• Revisiting Charmless Hadronic B_{u,d} Decays in QCD Factorization
• Charmless Hadronic B-Meson Decays
• B meson decays to charmless meson pairs containing eta or eta' mesons
• Suppression of flavor symmetry breaking in B decay sum rules
• Constraints on the anomalous tensor operators from B\toϕK^{\ast}, ηK^{\ast}$ and ηK decays
• Branching fraction and CP-violation charge asymmetry measurements for B-meson decays to eta K+-, etapi+-, eta'K, eta'pi+-, omega K, and omegapi+-
• Evidence for Direct CP Violation in $B^{\pm }\to \eta h^{\pm }$ and Observation of $B^0\to \eta K^0$
• Search for Resonant $B^{\pm }\to K^{\pm }h\to K^{\pm }\gamma \gamma$ Decays at Belle
• Pseudoscalar and Scalar Operators of Higgs-Penguins in the MSSM and B to phi K^*, K eta(') Decays
• Sum rules for B-->pi eta('), K eta('), eta(') eta(') decays