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- W2115512498 abstract "We report the observation of the $B$ meson decay $B^pmto J/psi eta K^pm$ and evidence for the decay $B^0to J/psi eta K^0_S$, using {90} million $BBbar$ events collected at the $ensuremath{Upsilon{(4S)}}xspace$ resonance with the $BaBar$ detector at the PEP-II $e^+ e^-$ asymmetric-energy storage ring. We obtain branching fractions of $cal{B}$$(B^pmto J/psi eta K^{pm}$)=$(10.8pm 2.3(rm{stat.})pm 2.4(rm{syst.}))times 10^{-5}$ and $cal{B}$$(B^0to J/psieta K_{rm{S}}^{0}$)=$(8.4pm 2.6(rm{stat.})pm 2.7(rm{syst.}))times 10^{-5}$. We search for the new narrow mass state, the X(3872), recently reported by the Belle Collaboration, in the decay $B^pmto X(3872)K^pm, X(3872)to jpsi eta$ and determine an upper limit of $cal{B}$$(B^pm to X(3872) K^pm to jpsi eta K^pm$) $<7.7times 10^{-6}$ at 90% C.L." @default.
- W2115512498 created "2016-06-24" @default.
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