Search for Narrow Resonances using the Dijet Mass Spectrum in pp Collisions at sqrt s of 8 TeV

We present a search for new particles decaying to jet pairs using the dijet mass spectrum measured by the CMS detector in pp collisions at $\sqrt{s}=8$ TeV. The data used correspond to an integrated luminosity of 4.0 fb$^{-1}$. The dijet mass distribution of the two leading jets is measured after requiring the pseudorapidity separation of the two jets to satisfy $|\Delta\eta| < 1.3$ with each jet inside the region $|\eta|< 2.5$. The measured dijet mass spectrum is fitted with a smooth, empirical parameterization which well describes the prediction from simulated QCD dijet events. In the current data sample we observe no significant evidence for new particle production. We set upper limits at the 95\% confidence level on the resonance cross section. By comparing these generic limits with theoretical predictions for the cross section of several models of new particles, we set specific lower limits on the mass of string resonances, excited quarks, axigluons, colorons, s8 resonances, $\mbox{E}_{6}$ diquarks, W' and Z' bosons, and RS gravitons in the 1-4.7 TeV range, many of which extend previous exclusions from the dijet mass search technique.