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Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 81: Supersymmetrie II

T 81.9: Talk

Thursday, March 28, 2019, 18:00–18:15, S07

Search for Higgsino production in SUSY scenarios with a compressed mass spectrum — •Yuval Nissan1, Peter Schleper1, Gudrid Moortgat-Pick2, and Sam Bein11University of Hamburg — 2DESY

A search for leptonic decays of Higgsino-like neutralinos in the case of a compressed mass spectrum using a track, a reconstructed lepton and missing transverse momentum is presented. We consider the case of a second-lightest neutralino decaying into a dark matter candidate - lightest neutralino - and two leptons via an off-shell Z boson. In the case of a very small mass differences between the neutralinos, the leptons produced are very soft, making it very difficult to reconstruct them at CMS. We consider a case where one of the leptons is reconstructed by a track, and the other as a reconstructed lepton of opposite charge. Signals of different mass splitting are probed and interpreted within a set of simplified models. Multivariate discriminants are employed in the event- and object-level selection, and their performance is studied.

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