Measurements of CP-violating Asymmetries and Branching Fractions in B Meson Decays to eta' K

Details Measurements of CP-violating Asymmetries and Branching Fractions in B Meson Decays to eta' K Measurements of CP-violating Asymmetries and Branching Fractions in B Meson Decays to eta' K

2003-03-31

arxiv.org/abs/hep-ex/0303046v2

Phys.Rev.Lett.91:161801,2003

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 postscript figues, resubmitted Phys. Rev. Letters in response to review. Revised K0s reconstruction efficiency calc

Scientific paper

10.1103/PhysRevLett.91.161801

We present measurements of the branching fractions of the decays B+ -> eta' K+ and B0 -> eta' K0. For B0 -> eta' K0s we also measure the time dependent CP-violation parameters S and C, and for B+ ->eta' K+ the time-integrated charge asymmetry Ach. The data sample corresponds to 88.9 million BBbar pairs produced by e+e- annihilation at the Upsillon(4S). The results are B(B+->eta'K+) = (76.9 +/- 3.5 +/- 4.4)*10^-6, B(B0->eta'K0) = (60.6 +/- 5.6 +/- 4.6)*10^-6, S = 0.02+/-0.34 +/- 0.03, C = 0.10+/-0.22 +/- 0.04, and Ach = 0.037 +/- 0.045+/- 0.011.

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