Measurements of Branching Fractions and CP Asymmetries in B-> etah Decays

Details Measurements of Branching Fractions and CP Asymmetries in B-> etah Decays Measurements of Branching Fractions and CP Asymmetries in B-> etah Decays

2004-12-15

arxiv.org/abs/hep-ex/0412043v2

Phys.Rev.D71:091106,2005

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 figures

Scientific paper

10.1103/PhysRevD.71.091106

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 decay B^+-> eta pi^+ and find evidence of B^+-> eta K+; the measured branching fractions are B(B^+-> eta pi^+)=(4.8^{+0.8}_{-0.7}(stat) +- 0.3(sys))*10^{-6} and B(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 (stat) +- 0.03(sys) for eta pi^+- and -0.49+- 0.31 (stat) +- 0.07(sys) for eta K^+-. No significant signals are found for neutral B->eta h decays. We report the following upper limits on branching fractions at the 90% confidence level: B(B-> eta K^0 < 2.0* 10^{-6}, B(B-> eta pi0)<2.5*10^{-6} and B(B-> eta eta) <2.0*10^{-6}.

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