Measurements of Branching Fractions and Time-Dependent CP-Violating Asymmetries in B to eta' K Decays

Details Measurements of Branching Fractions and Time-Dependent CP-Violating Asymmetries in B to eta' K Decays Measurements of Branching Fractions and Time-Dependent CP-Violating Asymmetries in B to eta' K Decays

2005-02-08

arxiv.org/abs/hep-ex/0502017v1

Phys.Rev.Lett.94:191802,2005

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 postscript figures, submitted to Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.94.191802

We present measurements of the B -> eta' K branching fractions;for B+ -> eta' K+ we measure also the time-integrated charge asymmetry Ach, and for B0 -> eta' K0S the time dependent CP-violation parameters S and C. The data sample corresponds to 232 million B Bbar pairs produced by e+ e- annihilation at the Upsilon(4S). The results are BF(B+ -> eta' K+) = (68.9 +- 2.0 +- 3.2) * 10^-6, BF(B0 -> eta' K0) = (67.4 +- 3.3 +- 3.2) * 10^-6, Ach = 0.033 +- 0.028 +- 0.005, S=0.30 +- 0.14 +- 0.02, C=-0.21 +- 0.10 +- 0.02, where the first error is statistical and the second systematic.

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