Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 36: Search for Supersymmetry II
T 36.5: Talk
Tuesday, March 16, 2021, 17:00–17:15, Tk
Search for Compressed Higgsinos in events with two oppositely charged soft and displaced leptons at the CMS experiment — •Alexandra Tews — Universität Hamburg, Hamburg, Deutschland
A variety of supersymmetric extensions of the Standard Model lead to light Higgsinos with compressed mass spectra and correspondingly large lifetime.
In case of pair production of Higgsino-like electroweakinos, e.g. χ1±, χ20, the decay of the second neutralino through an off-shell Z boson can lead to a pair of same-flavor opposite-sign leptons. These leptons can have very low momentum if the mass spectrum of the SUSY particles is sufficiently compressed (nearly degenerate).
Searches for SUSY 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 momenta of order of a few hundred MeV.