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

2005-08-12

arxiv.org/abs/hep-ex/0508030v1

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 3 figures, BELLE-CONF-0525, EPS05 497

Scientific paper

We report improved measurements of B decays with an eta meson in the final state using 357 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^+-) = (3.9 +- 0.5(stat.)+-0.2(sys.))*10^-6 and Br(B^+- -> eta K^+-) = (2.2+-0.4(stat.)+-0.1(sys.))*10^-6, respectively. Their corresponding CP-violating asymmetries are measured to be -0.10+-0.11(stat.)+-0.02(sys.) for eta pi^+- and -0.55+-0.19(stat.)+0.04-0.03(sys.) for eta K^+-. No significant signal is found for B^0-> eta K^0 decays; the upper limit on the branching fraction at the 90% confidence level is Br(B^0->eta K^0) < 1.9*10^-6.

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