Search for New Physics in the Paired Dijet Mass Spectrum

We report on a search for pair-produced particles both decaying into two jets, based on a data sample of $2.2$~$\mathrm{fb}^{-1}$ of proton-proton collisions collected at $\sqrt{s} = 7\TeV$ with the CMS detector at the LHC. We select events with at least four jets, require pairs of dijets with equal mass, and search for pair production of new particles. We set upper limits on the product of the resonance cross section, branching fraction into dijets, and acceptance. The cross section limit is compared with the predictions of a model of pair-produced colorons in which each coloron decays to $\mathrm{q\bar{q}}$. We exclude pair production of colorons with mass between 320 and 580 GeV at 95\% confidence level.