Progress Towards a Search for the Higgs Portal Scalar at ICARUS

The ICARUS experiment consists of a Liquid Argon Time Projection Chamber (LArTPC) detector at Fermilab in operation as a part of the Short Baseline Neutrino (SBN) Program. The ICARUS detector sits at the intersection of two neutrino beams: the Booster Neutrino Beam (BNB), which will enable SBN's primary eV-scale sterile neutrino search, and the higher-energy Neutrinos at the Main Injector beam (NuMI). The large intensities of these beams necessary for neutrino physics also enable searches for many Beyond Standard Model Physics models. One such model is the Higgs Portal: a scalar inherits couplings to Standard Model particles through a small mixing with the SM Higgs. This scalar could in principle comprise part of a larger dark sector. At SBN, the scalar would be produced primarily in Kaon decays at the NuMI beam, from which a fraction of them would then travel to the ICARUS detector and decay. A search for the di-muon decay of this scalar in ICARUS will be able to set new limits on this model in the couple hundreds of MeV mass range. I will discuss progress towards an event selection for the di-muon decay of the Higgs Portal Scalar, including methods for rejecting the neutrino background. I will also show a first look at data in the ICARUS detector related to this analysis.