SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 107: Searches – Neutrino at accelerators
T 107.3: Vortrag
Donnerstag, 23. März 2023, 16:20–16:35, HSZ/0101
Search for Compressed Elektroweakinos in Events with Two Soft and Displaced Leptons at the CMS Experiment — •Alexandra Tews — University of Hamburg, Hamburg, Germany
A variety of supersymmetric (SUSY) extensions of the Standard Model lead to light elektroweakinos with small differences in mass between the eigenstates.
One example is that of Higgsino-like electroweakinos, where the four states χ1±, χ20, and χ10 are nearly mass degenerate. The production of two elecroweakinos followed by the decay of the semi-stable second neutralino through an off-shell Z boson can lead to a pair of same-flavor opposite-sign leptons. The leptons can have very low momentum if the mass spectrum of the SUSY particles is sufficiently compressed and be displaced from the primary interaction vertex.
Searches for new physics in events with two low-momentum opposite-sign leptons are particularly sensitive to such SUSY models. Scenarios with compressed Higgsinos with a mass splitting below 2 GeV with the CMS experiment are studied. We exploit new reconstruction and vertexing techniques for oppositely charged displaced lepton tracks with very low momentum of order of a few hundred MeV to extend the sensitivity of current searches to unexplored phase-space.