Observation of the Decay B=> J/psi eta K and Search for X(3872)=> J/psi eta

Details Observation of the Decay B=> J/psi eta K and Search for X(3872)=> J/psi eta Observation of the Decay B=> J/psi eta K and Search for X(3872)=> J/psi eta

2004-02-13

arxiv.org/abs/hep-ex/0402025v1

Phys.Rev.Lett.93:041801,2004

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages and two figures, submitted to Phys. Rev. Letts

Scientific paper

10.1103/PhysRevLett.93.041801

We report the observation of the $B$ meson decay $B^\pm\to J/\psi \eta K^\pm$ and evidence for the decay $B^0\to J/\psi \eta K^0_S$, 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}$$(B^\pm\to J/\psi \eta K^{\pm}$)=$(10.8\pm 2.3(\rm{stat.})\pm 2.4(\rm{syst.}))\times 10^{-5}$ and $\cal{B}$$(B^0\to J/\psi\eta K_{\rm{S}}^{0}$)=$(8.4\pm 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 $B^\pm\to X(3872)K^\pm, X(3872)\to \jpsi \eta$ and determine an upper limit of $\cal{B}$$(B^\pm \to X(3872) K^\pm \to \jpsi \eta K^\pm$) $<7.7\times 10^{-6}$ at 90% C.L.

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