A search for B-L R-parity-violating scalar tops in $\sqrt{s}$ = 13 TeV $pp$ collisions with the ATLAS experiment

A search is presented for the direct production of scalar top pairs which decay through an $R$-parity-violating coupling to a final state with two leptons and two jets, at least one of which is identified as a $b$-jet. The dataset consists of an integrated luminosity of 36.1 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of $\sqrt{s}$ = 13 TeV, collected over 2015 and 2016 by the ATLAS detector at the LHC. No significant excess is observed over the Standard Model background, and exclusion limits are set on scalar top pair production at a 95% confidence level. Upper limits on the scalar top mass are set between 600 GeV and 1.5 TeV for branching fractions on the scalar top decay to an electron or muon and a $b$-quark above 10%.