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

Abstract

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.

7 pages, 2 postscript figues, resubmitted Phys. Rev. Letters in response to review. Revised K0s reconstruction efficiency calculation resulting in ~10% upward revision of the value of B(B0->eta'K0) (and downward shift of the charged/neutral ratio of decay rates); minor revision of systematic on C

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• The BABAR Detector
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• Flavor-Singlet B-Decay Amplitudes in QCD Factorization
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• Updated Analysis of Some Two-Body Charmless B Decays
• Isospin violation in e+ e- --> B Bbar
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• CP Asymmetries of $B\to \varphi K$ and $B\to {\eta }^{(\prime )}K$ Decays Using a Global Fit in QCD Factorization
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• Elastic and inelastic SU(3)-breaking final-state interactions in B decays to pseudoscalar mesons
• Alternative Approach to $B^{-}\to {\eta }^{\prime }{K}^{-}$ Branching Ratio Calculation
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