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

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

2006-08-10

arxiv.org/abs/hep-ex/0608033v2

Phys.Rev.D75:071104,2007

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 3 figures

Scientific paper

10.1103/PhysRevD.75.071104

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.

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