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Study of B-meson decays to ηcK(*), ηc(2S)K(*), and ηcγK(*)


We study two-body B-meson decays to a charmonium state (ηc, ηc(2S) or hc) and a K+ or K*0(892) meson using a sample of 349fb-1 of data collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. We measure B(B0→ηcK*0)= (5.7±0.6(stat)±0.9(syst))×10-4, B(B0→ηc(2S) K*0)<3.9×10-4, B(B+→hcK+)×B(hc→ηcγ) <4.8×10-5 and B(B0→hcK*0)×B(hc→ηcγ) <2.2×10-4 at the 90% C.L., and B(ηc(2S)→KK̄π)=(1. 9±0.4(stat)±1.1(syst))%. We also measure the mass and width of the ηc meson to be m(ηc)=(2985.8±1.5(stat)±3.1(syst))MeV/c2 and Γ(ηc)=(36.3-3.6+3.7(stat)±4.4(syst))MeV. © 2008 The American Physical Society.

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