Search for Higgsino Production in the 4b+Missing Transverse Energy Channel at the CMS Experiment

We present a search for supersymmetry (SUSY) using data collected at the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). Models of supersymmetry predict the existence of a variety of new, heavy particles. In particular, this search targets the production of higgsinos, the supersymmetric partners of the Higgs boson, focusing on the final state with two Higgs bosons each decaying via the H→bb process and large missing transverse momentum. Higgsinos decay into Higgs bosons and lightest supersymmetric particles, the latter of which act as the source of missing transverse momentum. To cover a wider range of higgsino masses, this search uses two distinct signatures, one where the fragmentation products of b-quarks are resolved into separate jets, and one where the two b-quarks from the Higgs boson merge into a single jet. Benefitting from the high H→bb branching fraction, this channel provides the best sensitivity in the high-mass higgsino region, where higgsino production cross sections are small. This search will include Run 3 data collected in 2022 and 2023 in addition to the full Run 2 data set. The increased luminosity and enhanced higgsino production cross section in Run 3 will provide higher statistical power. Combined with improved b-tagging efficiencies, this search is expected to significantly improve the current sensitivity limits to higgsino production at CMS.