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

Abstract

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

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

References in corpus (20)

• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• The BABAR Detector
• Short Range Structure in the X(3872)
• The D*0 D0bar threshold resonance
• Charmonium Options for the X(3872)
• Low-energy Universality and the New Charmonium Resonance at 3870 MeV
• Interference and binding effects in decays of possible molecular component of X(3872)
• Molecular States of Heavy Quark Mesons
• Observation of the eta_c(2S) in exclusive B-->K KsK-pi+ decays
• A Study of Time-Dependent CP-Violating Asymmetries and Flavor Oscillations in Neutral B Decays at the Upsilon(4S)
• B-Meson Gateways to Missing Charmonium Levels
• P-Wave Charmonium Production in B-Meson Decays
• On the hidden charm state at 3872 MeV
• Charmonium Hybrid Production in Exclusive B Meson Decays
• QCD analysis of inclusive B decay into charmonium
• Measurement of branching fractions for exclusive B decays to charmonium final states
• Rare B Decays into States Containing a J/psi Meson and a Meson with ssbar Quark Content
• Color-octet mechanism in the inclusive D-wave charmonium productions in B decays
• First Observation of the Decay $B\to J/\psi \varphi K$

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