Search for phenomena beyond the Standard Model in events with large $b$-jet multiplicity using the ATLAS detector at the LHC

Events with a large number of high-$p_{\text{T}}$ $b$-jets are rare in the Standard Model (SM); an excess of events with such topology would be a signal of phenomena beyond the SM. One phenomenon where a large excess is expected is a variant of supersymmetry in which R-parity is violated, allowing baryon number violating decays of the super-partners of the SM particles. This analysis presents the search for physics beyond the SM in events with at least eight jets and at least six $b$-jets. It was performed using Run 2 data collected by ATLAS detector corresponding to an integrated luminosity of 139 fb$^{-1}$ of $pp$ collisions at a center-of-mass energy of $\sqrt{s}=13$ TeV. We consider specifically the production of a pair of heavy scalar top quarks which decay to a $b$-quark and a chargino, which in turn decays into $bbs$ via a virtual stop.