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Description
The hunt for new physics at the LHC has driven an exciting research program for years, spanning challenges across multiple experiments and a vast range of lifetimes, from prompt to long-lived particles. Dark matter candidates can be produced in the LHC's high-energy proton-proton collisions and caught by ATLAS, provided they decay (nearly) promptly. Supersymmetry predicts exactly such a weakly interacting massive particle that can decay within ATLAS. In this talk, I will highlight recent higgsino searches, whose short lifetimes give rise to challenging, unusual signatures.
But what if dark matter doesn't couple to the Standard Model at all, hiding in an isolated dark sector? Then its only hint may be a long-lived mediator, one that can travel hundreds of meters before decaying, slipping past ATLAS unseen. The ForwArd Search ExpeRiment, FASER, was built to catch exactly these particles near the LHC. Taking data since July 2022, the collaboration has delivered results from neutrino measurements to new physics searches. I will highlight the latest results, zeroing in on the interplay between the two.