Branching Fraction Measurements of the Decays $B \rightarrow \eta_c K$, where $\eta_c \rightarrow K\bar K\pi$ and $\eta_c \rightarrow 4K$

Abstract : In this report, we present the observation of the exclusive decays B0 -> EtaC K0 and B+ -> EtaC K+, and the measurement of the related branching fractions. Using a sample of 22.7x10^6 Upsilon(4S) -> BBbar decays collected with the BABAR detector at the SLAC PEP-II asymmetric B Factory during 1999-2000, we have observed statistically significant signals in the EtaC -> KsK+Pi- and K+K-Pi0 channels and set upper limits in the EtaC -> K+K-K+K- channels. All the results presented are preliminary. We have measured BF(B+ -> EtaC K+) = (1.50 +/- 0.19 +/- 0.15 +/- 0.46)x10^{-3} BF(B0 -> Etac K0) = (1.06 +/- 0.28 +/- 0.11 +/- 0.33)x10^{-3} where the first error is statistical, the second systematic and the last due to the uncertainty on the world average EtaC -> KKbarPi branching fraction.
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Conference papers

http://hal.in2p3.fr/in2p3-00011489
Contributor : Claudine Bombar <>
Submitted on : Friday, May 3, 2002 - 3:22:44 PM
Last modification on : Wednesday, January 6, 2021 - 6:22:02 PM

Citation

B. Aubert, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, et al.. Branching Fraction Measurements of the Decays $B \rightarrow \eta_c K$, where $\eta_c \rightarrow K\bar K\pi$ and $\eta_c \rightarrow 4K$. Rencontres de Moriond on QCD and Hadronic Interactions 37, Mar 2002, Les Arcs, France. pp.1-16. ⟨in2p3-00011489⟩

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