Speaker
Description
A search is presented for pair production of higgsinos in scenarios with gauge-mediated supersymmetry breaking. Each higgsino is assumed to decay into a Higgs boson and a nearly-massless gravitino. The search targets the $b\bar{b}$ decay channel of the Higgs bosons, leading to a reconstructed final state with at least three energetic $b$-jets and missing transverse momentum. Two complementary analysis channels are used to target higgsino masses below and above 250 GeV. The low (high) mass channel uses 126 (139) fb$^{-1}$ of $pp$ collision data collected at $\sqrt{s}$=13 TeV by the ATLAS detector during Run 2 of the Large Hadron Collider, extending previous ATLAS results with 24.3 (36.1) fb$^{-1}$. No significant excess above the Standard Model prediction is observed. At 95% confidence level, higgsino masses below 940 GeV are excluded. Exclusion limits as a function of the higgsino decay branching ratio to a $Z$ or a Higgs boson are also presented.
