A search for R-parity violating decays of the top squark in four jet final states with the ATLAS experiment at sqrt(s) = 13 TeV

We present a search for direct production of pairs of stops, each decaying into a $b$- and an $s$-quark through R-parity violating couplings. The analysis uses $3.2$ fb$^{-1}$ of proton-proton collision data recorded at $\sqrt{s} = 13$~TeV by the ATLAS experiment at the LHC in 2015. Four jets, two of which are $b$-tagged, are selected and paired according to their angular separation. Signal regions are defined by imposing requirements on the masses of the two resonance candidates and their angular distribution. The average mass of the resonances is then used as the final discriminant. No significant excess is observed above the background prediction and 95\% CL limits on the mass of the stop of 345~GeV are derived.