Search for Massive Coloured Scalars with the ATLAS Detector in Four-Jet Final States using 4.6~\ifb of $\sqrt{s} = 7$~\TeV\ proton-proton collision data

A search for pair-produced massive coloured scalar particles decaying to a four-jet final state is performed in proton-proton collisions at $\sqrt s = 7$~\TeV. The analyzed data sample corresponds to an integrated luminosity of 4.6~\ifb. No deviation from the Standard Model is observed in the invariant mass spectrum of the two jet pairs. A limit on scalar gluon pair production cross section of 70~pb (10~pb) is obtained at the 95\% confidence level for a scalar gluon mass of 150~\GeV\ (350~\GeV). Interpreting these results as mass limits on scalar gluons, masses ranging from 150 to 287~\GeV\ are excluded at the 95\% confidence level.