Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 36: Supersymmetrie I
T 36.7: Talk
Tuesday, March 26, 2019, 17:30–17:45, S11
ATLAS sensitivity to higgsinos with a highly compressed mass spectrum at the HL-LHC — •Jorge Andres Sabater1, Federico Meloni1, Simone Amoroso1, Brian Petersen2, and Peter Tornambe3 — 1DESY — 2CERN — 3Freiburg University
Supersymmetry (SUSY) is a symmetry that introduces a relation between every Standard Model (SM) fermion and gauge boson with a superpartner state whose spin differs by half a unit. In the Minimal Supersymmetric extention of the SM (MSSM), the fermionic superpartners of the electrically neutral gauge bosons, the bino and the wino, mix with the Higgsinos, to form four neutralinos and two charginos physical mass eigenstates, often referred to as electroweakinos.
The talk will present the exclusion reach and discovery potential for direct electroweakino pair production in models with small mass differences between the lightest SUSY particle (LSP) and the second LSP at the High Luminosity LHC (HL-LHC). The electroweakinos decay via off shell W and Z bosons, resulting in a final state with two charged leptons, jets and missing transverse momenta coming from the undetected LSP. The analysis is done simulating the ATLAS detector performance in the HL-LHC regime where 200 interactions per bunch crossing will be reached and the amount of data collected will be 20 times greater than the present one. The results show a sensitivity improvement with the increased amount of data, leaving some room for possible SUSY discovery, and they also serve as a good complementarity with other future HL-LHC analyses.