Results of a search for new phenomena in final states with b-jets and missing transverse momentum is presented using 139 fb-1 of proton- proton data collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The search targets three models: pair-produced supersymmetric bottom squark decays into bottom quarks and a stable neutralino, dark matter particles produced through the decay of a scalar or pseudo scalar mediator in association with bottom quarks, and pair production of scalar third- generation down-type leptoquarks. Although no significant excess above standard model predictions are observed, limits set by previous searches are greatly improved upon. Bottom squark masses below 1270 GeV are excluded at 95% CL if the neutralino is assumed massless and excluded up to 660 GeV in the compressed region.
- dark matter