Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 81: Supersymmetrie II
T 81.5: Vortrag
Donnerstag, 28. März 2019, 17:00–17:15, S07
Searches for New Physics at the CMS Experiment Using Advanced Techniques for Lepton Reconstruction — Samuel Bein, Viktor Kutzner, Yuval Nissan, Peter Schleper, and •Alexandra Tews — Universität Hamburg, Deutschland
A variety of supersymmetric extensions of the Standard Model lead to low-mass Higgsinos with compressed mass spectra. Searches for SUSY in events with two low-momentum opposite-sign leptons as well as searches for disappearing tracks are particularly sensitive to such SUSY models.
A new data-driven method to determine lepton track reconstruction efficiencies in CMS is presented. This method is used in searches for disappearing tracks, which target compressed Higgsino models with mass differences among the Higgsinos of order of 1.4−10 GeV.
In addition, we consider the case of the production of Higgsino-like electroweakinos, e.g. χ1±, χ20, where 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 extremely compressed (nearly degenerate). Progress is reported on new methods for reconstructing low-momentum, displaced lepton pairs, which may be key in targeting the compressed, unexplored regions of the model phase space.