# Study of B-meson decays to $\eta_c K^{(*)}, \eta_c(2S) K^{(*)}$ and $\eta_c \gamma K^{(*)}$

Abstract : We study two-body $B$-meson decays to a charmonium state ($\eta_c$, $\eta_c(2S)$ or $h_c$) and a $K^+$ or $K^{*0}(892)$ meson using a sample of $349 fb^{-1}$ of data collected with the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. We measure $BR(B^0\to\eta_c K^{*0})=(5.7\pm0.6 (stat)\pm0.9 (syst))\times 10^{-4}$, $BR(B^0\to\eta_c(2S) K^{*0})<3.9\times 10^{-4}$, $BR(B^+\to h_c K^+)\times BR(h_c\to\eta_c\gamma)<4.8\times 10^{-5}$ and $BR(B^0\to h_c K^{*0})\times BR(h_c\to\eta_c\gamma)<2.2\times 10^{-4}$ at the 90% C.L., and $BR(\eta_c(2S)\to K \bar{K} \pi)=(1.9\pm0.4 (stat) \pm1.1 (syst))%$. We also measure the mass and width of the $\eta_c$ meson to be $m(\eta_c)=(2985.8\pm 1.5(stat) \pm 3.1 (syst)) MeV/c^2$ and $\Gamma(\eta_c)=(36.3^{+3.7}_{-3.6} (stat) \pm 4.4 (syst)) MeV$.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00271727
Contributor : Swarna Bassava <>
Submitted on : Thursday, April 10, 2008 - 3:38:56 PM
Last modification on : Wednesday, September 16, 2020 - 4:20:33 PM

### Citation

B. Aubert, M. Bona, Y. Karyotakis, J.P. Lees, V. Poireau, et al.. Study of B-meson decays to $\eta_c K^{(*)}, \eta_c(2S) K^{(*)}$ and $\eta_c \gamma K^{(*)}$. Physical Review D, American Physical Society, 2008, 78, 012006 (9 p.). ⟨10.1103/PhysRevD.78.012006⟩. ⟨in2p3-00271727⟩

Record views