Measurements of branching fractions and time-dependent CP-violating asymmetries in B -> eta ' K decays

We present measurements of the B ->eta(')K branching fractions; for B+->eta(')K(+) we measure also the time-integrated charge asymmetry A(ch), and for B-0->eta(')K(S)(0) the time-dependent CP-violation parameters S and C. The data sample corresponds to 232x10(6) B (B) over bar pairs produced by e(+)e(-) annihilation at the Upsilon(4S). The results are B(B ->eta(')K(+))=(68.9 +/- 2.0 +/- 3.2)x10(-6), B(B-0->eta(')K(0))=(67.4 +/- 3.3 +/- 3.2)x10(-6), A(ch)=0.033 +/- 0.028 +/- 0.005, S=0.30 +/- 0.14 +/- 0.02, and C=-0.21 +/- 0.10 +/- 0.02, where the first error quoted is statistical and the second is systematic