Speaker
Description
Among many minimal and phenomenologically motivated Supersymmetry (SUSY) scenarios, the "compressed mass spectra scenario" is the one of the most appealing. This is favored by the observed dark matter relic abundance and the naturalness argument and so on, where the electroweak gaugino (EWKino) states typically have O(1) GeV - 100 GeV mass splitting between them. While these EWKino states can be directly probed in collider experiments, due to the challengingly indistinctive signature and the small production cross-section, they are poorly constrained compared to other SUSY particles. For instance, 100-300GeV EWKinos are still fairly viable.
This talk describes a dedicated compressed spectra search program in the ATLAS experiment, development of a new analysis technique, and the recent results using the full Run 2 dataset from $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector.
