A search for B−L R-parity-violating top squark decays in $\sqrt{s}=$ 13 TeV $pp$ collisions with the ATLAS detector

A search for pair produced massive particles decaying to b-quarks plus leptons is presented using the $\sqrt{s}=13$ TeV proton-proton collision data collected with the ATLAS detector at the LHC in 2016. This search is motivated by a B-L extension to the MSSM, in which the scalar partner of the top quark (the stop) may be the Lightest Supersymmetric Particle (the LSP). In this model, the stop predominantly decays via an R-Parity violating coupling to a b-quark plus a lepton. This model is targeted by searching for an excess in final states containing b-tagged jets and two light leptons (electrons or muons).