Search for Double J/Psi Resonances in CMS at the LHC

We have analyzed an integrated luminosity of 4.5 fb$^{-1}$ of proton-proton collision data from the LHC with the CMS detector in search for the J/Psi J/Psi decay of the eta-b meson, the pseudo-scalar ground-state of bottomonium. The cross-section times decay width is predicted at a level of 10$^{-4}$ to 10$^{-8}$. We perform a maximum likelihood fit to the 4-muon invariant mass and the decay length to extract the signal yield.