A search for pair-produced resonances in four-jet final states at √s=13 TeV with the ATLAS detector

A search for massive coloured resonances which are pair-produced and decay into two jets is presented. The analysis uses 36.7 fb $$^{-1}$$ of $$\sqrt{s}$$ = 13 TeV pp collision data recorded by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the background prediction is observed. Results are interpreted in a SUSY simplified model where the lightest supersymmetric particle is the top squark, $$\tilde{t}$$ , which decays promptly into two quarks through R-parity-violating couplings. Top squarks with masses in the range $$100~\text {GeV}<410$$   $$\text {GeV}$$ are excluded at 95% confidence level. If the decay is into a b-quark and a light quark, a dedicated selection requiring two b-tags is used to exclude masses in the ranges $$100~\text {GeV}<470$$   $$\text {GeV}$$ and $$480~\text {GeV}<610$$   $$\text {GeV}$$ . Additional limits are set on the pair-production of massive colour-octet resonances.