| Abstract |
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We present measurements of the CP-violation parameters
S and C for the radiative decay B0 -> eta K0s
gamma; for B -> eta K gamma we also measure the
branching fractions and for B+ -> eta K+ gamma the
time-integrated charge asymmetry Ach.
The data, collected with the BaBar detector at the Stanford Linear
Accelerator Center, represent 465x10^6 BBbar pairs
produced in
e^+ e^- annihilation. The results are S = -0.18^{+0.49}_{-0.46} +\-
0.12, C = -0.32^{+0.40}_{-0.39} +\- 0.07, BF(B0->eta K0 gamma) =
(7.1^{+2.1}_{-2.0} +\- 0.4)x 10^{-6}, BF(B+ -> eta K+ gamma) =
(7.7+-1.0 +- 0.4)x10^{-6}, and Ach = (-9.0^{+10.4}_{-9.8}
+\- 1.4)x10^{-2}.
The first error quoted is statistical and the second systematic.
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